It's on the road map, but has yet to be defined more closely. The idea so far is that star systems would be generated just like stars are generated now, based on the host star type. Planetary terrain comes after that, of course, but whether that will be part of this asset or a separate one is not certain as of yet. It's also a pretty big project to do properly. There are good planet generation assets in the store already, so it's not a top priority. The scope of this feature is hence yet to be determined.