Got into the early access and it feels like a newly skinned/graphics updated version of the old. Looks and feels great! But at this point there isn't much of a game to play, just a free build-your-spaceship sim. Fun as such, but not worth $50. Maybe $20.
Features I hope to see in the future: separate timelines for steering different parts of the same craft (reusable boosters), fun missions. I really like the career mode of KSP1 and I was hoping some of that would've been implemented already.
So yeah, just a really pretty version of KSP's "sandbox" mode. Looking forward to more.