Could be space themed, but might also be a mountain getaway, mountain climbing having been on the list of possible themes in a previous survey.
Seeing that this is the "major first" GP, our sims not having a permanent home, but traveling from planet to planet would certainly be a major first. I imagine the home lot would always be the same and fully buildable, but the backdrop would change upon "travel" and the other lots in the neighborhood make use of the EL community space buildmode with different appearances for the same lot (depending on what solar system you are in atm?). If the concept gets accepted by the players, they might - just might - recycle it in form of cruise ships. I'm down for both.
