Meaning if I purchase the Alpha game key, will that give me access to the game engine during Alpha to start looking at that side of things?
Watching the demo today woke up, in me, some long forgotten excitement. My son and I enjoy the hell out of Minecraft. It's a great game and it arrived in its space at just the right time.
What you're doing, though, is going to push things in a new, even more exciting direction, in ways that you can't even imagine yet.