Personaly the only thing im really looking forward to now is more then one solar system. Untill then, back burner ho?
Why would you want more solar systems as of now when they will all be carbon copy of another with no real features to distinguish them apart (because there are no game mechanics that can create any meaningful variety yet)?
More because of the modding side, its the part of the mod that takes the longest since you need to create a custom galaxy, so getting this early even with nothing new added would be great...
More content that's playable and fun is going to be better for encouraging new buyers, to help keep the game funded, than content aimed at a minority of people who already have it. It's great Alex is so supportive of modding and mods are an excellent way of adding more play time, but mods (and
total conversion mods, which are generally some of the less popular) shouldn't be prioritised over improving the actual *game*.