I think that what we have now is not enough for all the players. It is already hard to find a place with no miners or hunters and GD on radar are everywhere. We need more space.....
I'd be most glad if this planet would be much bigger than Calypso. For example with 3 or 4 continents and some outposts like places prepared by "special forces" for the colonists with teleports, storages and TTs, repairs and soc terminals. Or just old and ruined cities of some odd civilization with teleports in there.
I think that it would be nice to have a planet with different atmosphere, so you would need a special suite or an oxigen mask to go there and leave the safe zone (I imagine this as sort of station - big city, where you land or start the game). Ofc
MA would make the masks L, so we can skip this part for the sanity of mind :P
There should be some mobs that would be new (all new, no old mobs as they live only on Calypso), and in some places the spawn should be big to keep hunters there, and in some places no mobs to give space for miners. Ofc small and easy mobs (for those who start their
EU life there) and hard mobs for strong players.
As for miners I think that
CND style would be nice - not so often like on Calypso you'd hit anything, but you would find nice sizes and maybe some new resources as this planet would have different structure.
It would be nice to have places of all kinds (like each continent a bit different):
non PVP hunting zone
PVP hunting zone
non PVP mining zone (with rare or no mobs)
PVP mining zone (and only some parts lootable, if there have to be any with mobs this time, and strong would be nice)

Dreams
But we shall see what future brings...
I bet this will be all taxed and soon too small for all of us anyway....