While we are likely to find sci-fi authors, actors etc, I doubt we'll actually find franchise-specific characters and planets (eg. Tatooine, Arrakis, Kobol, Spock, Betazed, Krypton, Gallifrey) in the game, as these would all be copyrighted. Any that may have slipped through, due to a beta-backer assigning such a name, would be deleted once the copyright infringement was brought to their attention (possibly by the franchise-owner's lawyers).
You might (and probably will) find names that occur in both sci-fi and in Earth history/mythology (eg. Pandora, Apophis, Miranda, Vulcan). In such cases, it's the fault of the franchise for using a public-domain name.