I'm curious how they will handle earthlikes.
- Procedurally generated flora (not NMS style with different colours and names but actually GENERATED)
- Procedurally generated fauna (more difficult and not really that important until they have the ability to make space legs a playable reality)
The difficult part has to be flora to make planets really UNIQUE. Populated worlds can have earth plants introduced by settlers with terraforming but alien worlds needs to be well, alien.
And most importantly, they NEED to get mountains right. Infinity: Battlescape hit the nail on the head with that part.