A new game from the creators of Wii Party is currently in development for the Wii U. From the looks of the footage shown this morning during Wii U Direct, it plays out over a game board, much like Mario Party, launching the players into various mini party games.
While some of the included use the television, others will the Gamepad and Wii remotes. One shown uses the Gamepad and three Wii Remotes for something like a finger version of Twister. Another uses the Gamepad's sides for two-player action, with foosball and baseball examples shown.
I'm sure we'll hear more about this game closer to this year's E3.