Kotaku got their hands on a leaked poster for Watch Dogs, where it clearly states, as you can see to the left, that the title is coming to all home consoles. This suggests support for a PS3, 360, and Wii U as well as a PS4 and 720 release, assuming they come out before the game itself does. We mean no offense to the Wii, but it simply can't run the game. Kotaku reached out to Ubisoft about the leak and they didn't deny it, but they also refused to comment on what platforms they have committed Watch Dogs to. In other words - publicly there are still no known platforms for the game, internally... you get the idea.
Given that this poster (there is another section inside) has not been refuted and denied by Ubisoft, it's pretty much as close to a confirmation that this is real that we are going to get without them specifically talking about platforms. This is exciting stuff, folks. Of all versions, the Wii U one excites me the most with the GamePad possibilities with a game that truly looks built for it. It's also notable, for those that wish to not put stock in a Wii U version, that it's made by Ubisoft Montreal. The same folks who already have extensive experience with the Wii U thanks to ZombiU and Rayman Legends.