Hi, sorry for the late reply. You are not able to play it right now and I don't know when the game will be finished. I still need to put my real life in order. Anyway, I'd say the game is more than 50% done.
Yare 3 will be somewhat of an adventure game. It will have a good story (according to me at least) which will explain lots of things from the previous games. It will certainly include BE/AE/PG/HE and maybe other types of expansions/ weight gain/ transformations.