Just in case anyone here was holding out for an official release...it's out.
If you need me, I'll be strapping boosters to my poor Kerbal's back and landing on the Sun.
I did try the demo of this a while back. Never found the time to properly get into it though!
Oh, it's well worth it. Plus it's the easiest game to mod I've ever come across. The Dev's welcome mods and regularly incorporate them into the game itself on updates.
It's oddly satisfying and makes me feel smart. I mean after all, it's ONLY rocket science.