PewDiePie has said that the iOS and Android platformer based on him called PewDiePie: Legend of the Brofist should be out in the next month of two. This info comes from one of his latest videos in which he plays through the first level from the game.
The level has you collecting PewDiePie's dogs and other friends from his house while the evil barrels attack. There are also Bro Coins to collect to buy upgrades. At the end of the video, PewDiePie says that Legend of the Brofist should be out by the end of August or the beginning of September. However, he adds that none of this is definite right now.