for me, soon on (E)Vita. The truth is Klei's dark realization of wilderness survival hits the Sony handheld on September 2 in North America and the day after in Europe, priced at $15 and 14 euros. It includes the Reign of Giants expansion that came to PS4 separately back in July
, but at no extra cost.
Despite that disparity, Klei's made the Vita version cross-buy; if you own the game on PS4 you unlock it on Vita, and vice-versa. Don't Starve
isn't cross-play, though, so saves won't cross over between PS4 and Vita.