Saw this being posted on twitter and thought I'd come and chime in.
I'd love there to be new planets and expand upon the existing ones.
Brought some joy into the game seeing Ossus recently, and Odessen before that.
At the same time I'd love to return to the planets from the first fifty levels instead of rolling out a new toon.
Enjoyed that we got to revisit some of the heroics on those planets when the Odessen mission terminals were introduced. Once my main maxed out the favour of the four advisors however, I stopped with the heroics.
Those are my two cents on the matter. Look forward to seeing what's down the road.