In Classic, the planet system you warp to essentially have no in-game function, whether it is a gas giant, moon, asteroid belt, neutron star, etc. They are simply pretty backdrops on which battles take place.
Would you change this in the sequel? Planetary bonus? Or simply a graphical hint, e.g. asteroid belt have lots of deposits, while gas giants can support a lot of orbital facilities?
How would you consider a Sins of a Solar Empire approach where planets are the primary sources of a class of income?