This is the first of 3 short films made by Ubisoft itself to hype up the upcoming Assassin's Creed 2 release in November. The films will be all avaliable on youtube and the quality is really good for a web only release.
Here's the trailer:
http://www.youtube.com/watch?v=Y3cdPfTqSgo
and the first 14min movie/episode:
http://www.youtube.com/watch?v=ct2kbLBuSOg