I've yet to DL it, I just wondered if they sent it to everyone or if I was lucky?!

Seemingly none of you care, but it was a Templar Hideout mission where you chase a dude then climb some shit, took 10 minutes, but for free so who cares. Although it unlocked previously locked on-disc content, so I assume it was probably available with a previous SE release?

Weird. Been trying to figure out the uPlay stuff - seems like most of it can be unlocked in game already anyway?  Maybe I'm wrong about that. 
Do you remember signing up for anything special or doing anything special? (Facebook Game, CE Edition etc)

Nope, it says in the email it is because I am a registered uPlay user. None of the uPlay stuff can unlocked in game, but it is all stuff that doesn't affect the game in anyway, so it doesn't really matter. Free shit is free though :D

I got it free as a pre-order bonus at Gamestation.

But.. If you got it for being a registered Uplay person. Why didn't I get one? I am too..

Been a Uplay member for a long time and I've still not received this DLC e-mail i've heard about.