I wish the announcement was Darkstalkers 3.  That would have been a far more appealing announcement Capcom.

Would be interesting to see if Namco's game gives the Street Fighter characters the realistic paced moves of the Tekken games, bring them back to a more real art style and give them real martial arts. 
I just want Tekken 2 Lei and Yoshimitsu.

Tekken and Street Fighter? Well, I'll be damned.

Ganryu + Bob VS. E.Honda + Rufus. this should be pretty awesome

Since I grew up playing Tekken (albeit 4, which is apparently horrible) I'm way excited to see what Namco does.
 
I can probably guess though.

CAUTIOUS OPTIMISM.

" I'm way more excited for Namco's version to be honest. "

Meh

Bring SF vs MK instead. Would be much more interesting and fun. 
 
At least it's Street Fighter VS Tekken and not Capcom VS Namco, I'll give them that. Although it would have been fun to see Ryu fight Pac Man.

"I was a serious Tekken fan early on, but once Tekken 4 hit, that and the subsequent sequels felt like they were quickly losing their way."

I would think Tekken X SF would be more interesting to see SF characters on a 3D engine.

Lovely trailer, but zero interest. 
SFIV is not to my taste. I'd much rather have an Arc System Works vs Capcom as well, with 2d sprites. I really don't like the chunky look they have in SFIV.

I think the storyline in Tekken X Street Fighter would be far more apeshit crazy and enjoyable than the Street Fighter X Tekken would be. I'm a bigger fan of playing SF, but Tekken does have a stronger 'WTF' factor that makes the franchise kinda fun.

Too sad, I was really looking forward to Namco vs. Capcom...you know, with Darkstalkers and Soul Calibur thrown in, plus a handful of side characters (Klonoa, Eternal Sonata stuff, Tales of Symphonia/Vesperia, Xenosaga, Baten Kaitos, etc. for Namco) from each company.

 
 Just thinking about Chun-Li in a Tekken game with a Tekken move set gives me the chills.
After Lili and Asuka (oh god, please let at least one of those make the cut) she'll be the third girl I'll actually (kinda) learn
how to play.
I love the SF universe, but I kinda lost interest in actually playing the games after the third Alpha. I'll still check out Capcom's 
version, though I seriously dislike the art-style of the current SF game(s).

EVERYONE PAY ATTENTION! The best thing ever is going to happen because of this crossover.
 
Just think about Tekken for a Second. What fighter does Tekken have? Puma! A fucking bear. What does Street Fighter have? Zangief! See where I am going with this.
 
We are finally going to witness ZANGIEF WRESTLE A FUCKING BEAR!

" EVERYONE PAY ATTENTION! The best thing ever is going to happen because of this crossover.   Just think about Tekken for a Second. What fighter does Tekken have? Puma! A fucking bear. What does Street Fighter have? Zangief! See where I am going with this.  We are finally going to witness ZANGIEF WRESTLE A FUCKING BEAR! "

Bummer, two fighting franchises I have no interest in =( 
 
As this seems to be Ono's big announcment that means an even longer wait for a new Darkstalkers. Hope fans of these series find some fun in this new crossover though. At least I have MvC3 to look forward to.

I will play the Street Fighter X Tekken version but ONLY if it isn't all the way 2v2. If it has a 1v1 mode then I am all about it. If not, then I will be playing a lot of the new Mortal Kombat next year for my fighting game fix.

I'm not big on Tekken, but I can never get too much Street Fighter. Never.

*sigh* will MK vs SF EVER exist?

Alot of fighting game coming out now, there gane over populate the market again!! we need only a few that we can all play together, we dont need a 1000 playing that game and a 1000 this &so on. dam em, this can only go bad! gana end up back like we were a few years ago.

Good stuff.  Both games will give the Tekken franchise a big boost in the NA market.  Tekken does gangbusters in Japan and S.Korea but seems to be a red-headed stepchild here in the west.

" Tekken's characters absolutely cream over the SF cast in terms of memorability so this is one crossover I'm exceptionally looking forward to! Namco version of course. I've always preferred my Tekken fighting style to SF's 2D plain. "

" Bah, just let the genre die in peace. "

I got Tekken 2 with my Playstation I played that game for like 2 years straight and I got Tekken tag with my PS2, SF4 was the 1st Street Fighter I got into so im really interested with this, not liking the whole SF pause bullshit when you tag through takes away from the action might just wait for the namco version.

I think it would be more interesting if they released a new Darkstalkers games instead or  better yet think about a Darkstalkers VS Power Stone. Think about it for a second!