Any chance this will get all the cool features, like achievements, in-game overlay, controller support, etc? Or will it only have single player, like other games that have achievements on Steam, but none on GOG? Also, will there be any pre-order bonuses? Trying to decide whether to pre-order it or not and, if yes, where to do it.

Multiplayer? Maybe you should learn the first thing about the game before even considering a purchase here or anywhere else.