Nintendo have announced that three Wii U titles have been pushed back from previously presumed release dates and are now expected to be released before the end of June (presumably early summer). The affected games are Game & Wario, Wii Fit U, and the highly anticipated Platinum Games' production The Wonderful 101.
Nintendo have already confirmed that Pikmin 3 has slipped beyond the first quarter, and there is a bit of a games drought on Wii U.