It will probable be 0.4.0. cause if there are features added it gets a 2nd digit upgrade. If there are bugfixes it will get a 3rd digit update, and if the game is totally recode or if it becomes a beta game, it will get a first digit upgrade. So Feature = 0.3.0 -> 0.4.0, bugfixes = 0.3.0 -> 0.3.1., recode = 0.3.0 -> 1.0