More details on it and the recently announced FIFA game for Wii U are coming over the summer.
There will be a Madden game on Wii U this year, EA confirmed today at E3. The company also announced that more details about this game and the recently announced FIFA game for Wii U will be coming later this summer.
The Madden demo EA showed off in their press conference earlier this week focused on deeper storylines in the game's career modes, focusing on reaching the Pro Football Hall of Fame. It is unknown at this time whether the Wii U version will incorporate these features or who is developing the game.