IndieCade have announced a line up for this year's E3 that includes a series of games on PC, PS Vita, Mobile and Sifteo Cubes. The "Flower Vita" listing in the PS Vita category was a bit of a surprise. Nothing is official as of yet. The Thatgamecompany twitter referred to it as a rumour, while stating they're not doing DLC or ports. So perhaps it's being ported somewhere else?
Anyway, Flower is a game that deserves a larger audience, so it's all good.