On the original topic, I see AI War as a superbly balanced, incredibly intricate, infinitely customisable game with enough depth to keep the vets happy for millenia. So I'd suggest focusing on things that will improve the experience for newbies. You've already mentioned the tutorial, but another thing is updating the wiki regarding some of the more complex or recently-updated game mechanics, such as Special Forces, the Strategic Reserve, threat behavior, focused reinforcements, the effect of ingress point number on waves, and the effect of neutering planets (wormhole and other guard posts) on reinforcement volume and planet capacity. Actually I guess the wiki can wait until after release, but it may be worth addressing anything on Mantis that would especially impact newbies. I just reported
this which could terribly confuse a newbie. At the risk of pimping my own reports, a lot of
this is most relevant to newbies, and
this idea was proposed with newbies in mind (and did well in the 6.0 poll).