I think I'll start rendering the vanilla skyboxes once they're all done and while that's in progress I will work on the third party skyboxes (which are not that many so it shouldn't take too long I hope). Then I'll see how far I got with those once the vanilla renders are all done.
Actually it's been only about 2.5 years since I started with V2. Terragens v4 came out a few months earlier and while it has seen some improvements since that major release, there are no big new features or anything like that. At least none that I know of.
Also, while I'm here: I'm not dead and work on those Nar Shaddaa buildings is continuing very slowly. My focus in the last months simply was on other personal projects and my masters thesis. That might/should change in a few weeks however.