IGN: Though we've already seen the teaser, which is as good an announcement as any, Ubisoft today made the officially official announcement of Assassin's Creed II. While we already knew it was coming, one interesting bit of info is included within the text - a holiday 2009 release window on all current-generation systems, which reads to us like it's hitting the PS3, Xbox 360 and Wii (and probably the PC as well). Note that the first title never hit Nintendo's latest console.
We recently posted some details on what the game will entail, so be sure to check that out if you haven't already. And don't forget to hit up our media gallery for a couple teaser trailers.
Update: Ubisoft has confirmed that the game is also coming to the PSP.