I personally think that we have to look at this at a different angle than a normal game. A lot of the ‘decisions’ about what version of what we would be using and so on can be changed fairly quickly once they have everything in place. I honestly think once they have the game at a point where they think it is 100% playable in terms of no bugs (that they are aware of), and all quests/dungeons completely scripted and working, that is when we will get a beta or at least an update and they will start looking at these ‘version’ issues in terms of what they should use.
With that said I believe it’s safe to say what version was in 1.12 is what they are planning on. Not that it can’t change, but that is probably what they are starting with. For example, discussing and worrying about what version of AV they should use is kind of pointless if they don’t even have AV/the rest of the game at a playable state.