It's highly unlikely that any game from Ubisoft will arrive on Linux
Ubisoft is teasing inside its latest game in the Assassin Creed series, The Black Flag, Linux support for its titles.Assassin's Creed IV: The Black Flag has registered a big success, and the game is full of throwbacks to the old titles in the series.
If you're like me and you like to explore everything in a game, then you will also find this Linux reference in Assassin's Creed IV: The Black Flag. It's more like an Easter Egg and it's hidden pretty well.
One of the images I found while I playing was of the cover art for Assassin's Creed IV: The Black Flag, but with a modified Tux logo in one corner.
We can presume two things from this image: either this is just a fun Easter Egg for people who know to how recognize the Tux logo and are happening to play a Windows game, or they intend to provide Linux support sometime in the future and this is a way of telling people.
If it's just a taunt, then it would be a really uncool move from Ubisoft to flaunt something like Linux support that they know it's not actually coming.
Update: It seems that not every Penguin logo represent Linux. In this case is the logo of Penguin Books, a large UK publisher. Mystery solved.