Give me a new race to play and more character slots and I'm 100% in but a planet is ify for me. Sure you get 5 extra lvls and new gear but I would rather see a new species to play. Planets that I just go to and leave and thank god I'm off of that rock, mmm not sure about that.
I'm in the opposite end. I'd rather have new skills than a new race. A new race is completely cosmetic and then you're just playing the same the same game.