Well, the game hasn't even been given a date yet but it looks like the ending is already leaked out. 
 
It's not the final version, and it's still done with the early Maya concept, but the voice acting is there.  Also, for some reason they are using the Transformer's Soundtrack...weird.  I guess it's filler. 
 
Luckily Kotaku saved it before YouTube took it down due to Blizzard's request. 
 
Enjoy 
 
EDIT:  My mistake, I should be thanking the company that takes care of Blizzard's CGI stuff.  Thank you "the third floor", enjoy your future employment with Blizzard.

Why would people want to watch this now? 
 
You're just gonna have to wait 3-4 years to see what happens after.

Nice video. If this is really the ending, I bet Blizzard is going to change it. 

" Why would people want to watch this now?  You're just gonna have to wait 3-4 years to see what happens after. "

A: Don't watch it if you care.

B: The games not out, they can change it.

The biggest thing about this leak is that it shows just how far away HotS is. =/

That's a pretty bad leak, kind of feel sorry for them :\

" @Jeffsekai said:

" Why would people want to watch this now?  You're just gonna have to wait 3-4 years to see what happens after. "

I assume it would have been touched up but damn, that CGI does not look very great.  and I happen to not give a shit about starcraft, so there! "

I'm just curious about when this game takes place  
 

Wow, it's going to be so difficult to avoid spoilers for this game now.

LOL

If this was the intended ending for Heart of the Swarm, then I gotta say, it was an immensely boring and uninspired conclusion.  Again, this whole story is turning out to be quite flat it seems.

" Look at the date on the top right, april 08 2009.   Was prolly the original ending to wings, before they changed. "

Obviously not final. 

Yikes, I cannot imagine how demoralizing this would be for people working on the game. 
 
That being said, yeah, I watched it.

" I read somewhere that this was going to be the ending for Wings before they changed it. "

" @Jeffsekai said:

" Why would people want to watch this now?  You're just gonna have to wait 3-4 years to see what happens after. "

I assume it would have been touched up but damn, that CGI does not look very great.  and I happen to not give a shit about starcraft, so there! "

If Heart of the Swarm goes in this sort of direction, I'll be disappointed.  Not a fan of this new story and all the focus on Raynor and Kerrigan.  Sure, they're cool characters, but the Starcraft universe has so much more to offer than this.  SC 1 and Brood War, imo, had some of the best game storylines ever.  though the missions may not have been as diverse as the ones in Wings of Liberty, at least all of them progressed the main arcs in some fashion.  
 
Join me as I reminisce about some of the awesome parts of the originals.  Starcraft 1 spoilers:

" Yikes, I cannot imagine how demoralizing this would be for people working on the game.  That being said, yeah, I watched it. "

Wow. That's actually a great teaser for the game. I have no Idea how it came to the point of what's happening in this video, the only thing you see is what you were promised by the end of Wings and I just want to see more great CGI sequences and great missions out of the next game. If you are afraid it will spoil something don't worry, there is nothing really major in it, except for one thing and it's not explained.

" @csl316:  Multiply that SC2 spoiler by the three parts that will eventually make up the game, then bingo! The list is just long enough! :| "

The fact Kotaku even posts this bothers me. I'm fine with posting leaked info about a game that doesn't really tell much, but this is [possibly] the ending of their next game. This is huge. This isn't something you just throw out there years before the game comes out. You don't have to watch it, I know that, but they didn't have to post it either.

" Wow. That's actually a great teaser for the game. I have no Idea how it came to the point of what's happening in this video, the only thing you see is what you were promised by the end of Wings and I just want to see more great CGI sequences and great missions out of the next game. If you are afraid it will spoil something don't worry, there is nothing really major in it, except for one thing and it's not explained. "

" @Jeffsekai said:

" Why would people want to watch this now?  You're just gonna have to wait 3-4 years to see what happens after. "

I assume it would have been touched up but damn, that CGI does not look very great.  and I happen to not give a shit about starcraft, so there! "

I don't get it, what about this video suggests that it would be from Heart of the Swarm, let alone be the very closing cinematic?
 
Judging from what happens in it, and the Kerrigan model, and the date which this was made and that this somehow got leaked, it seems like it was an alternate ending for Wings of Liberty that they ditched after making the animatic for.

I somehow doubt that this is the real ending, it's crap. Kerrigan gets her ass saved by Raynor again, good job making Kerrigan into even more of a damsel in distress. I really doubt Blizzard would let something like this slip out. And yes, I know it's the production company that leaked it, but I think they'd keep a tight lid on it. I don't really care anyway, we'll see it when HotS actually comes out.
 
It was kinda hilarious though, all the characters kinda looked like handpuppets without the lips moving when they talked.

"It was kinda hilarious though, all the characters kinda looked like handpuppets without the lips moving when they talked. "

Looks more like a scrapped storyboard for the wings of liberty ending. 

I watched it cause i don't really mind crappy graphics, besides i'm sure we all knew this was coming... but i gotta say its weird when my expectations are met... i mean expected some sort of surprise, is this for real?? like is it confirmed?

" @Jeffsekai said:

" Why would people want to watch this now?  You're just gonna have to wait 3-4 years to see what happens after. "

I assume it would have been touched up but damn, that CGI does not look very great.  and I happen to not give a shit about starcraft, so there! "

It's using Transformers Soundtrack music. Faaaaake.

" It's using Transformers Soundtrack music. Faaaaake. "

Now we just gotta wait 2 years to get. 

" @GunslingerPanda said:

" It's using Transformers Soundtrack music. Faaaaake. "

...you know production companies use it for filler right?   "

I don't think this is gonna be for HotS. Doesn't really seem to jive with the direction WoL was going.

If I watch it now I'll forget by the time the game is out. 
*watches* 
AND NOW I KNOW

" @KaosAngel said:

" @GunslingerPanda said:

" It's using Transformers Soundtrack music. Faaaaake. "

...you know production companies use it for filler right?   "

No I did not know this. "

I'll pass on watching. It is kinda like the day the last Harry Potter book came out, people waited in line to get the book and a person drives by, yelling that Snape kills Dumbledore.  Kotaku may not be as big as a dick like the person in the video but it sucks that a popular website would release this amongst the readers, news will spread, people will spoil those who tried to stay away. Sigh... sadness.
 
I'll wait till I play the game and then I'll watch it. Don't mind waiting years for it.

If I was anyone at Blizzard or indeed anyone at Third Floor I'd be pissed at whoever leaked that video.