As far as i can tell, it should...maybe not in the detail that you have suggested but on the galactic conquest screen there is an option for custom maps (im pretty sure anyways) So it seems logical that something of this nature would be allowed. I sincerely hope it isnt just "you pick what planets you want to be allowed" b/c that would be pointless.
Having said that.....We [I atleast] still have no 'real' information about the patch, map editor, mod tools, etc etc. So there really doesnt seem like theres any way to answer the question until the notes or editor itself are released. :-/