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LucasArts might be working on another Star Wars game. LucasFilm filed trademarks for Star Wars: First Assault and First Assault for use with video games, online enabled games, and social networking services. The trademark classifications are the same as the Star Wars 1313 trademark which was filed before a game was revealed at E3.
On top of trademarks, a domain name for Star Wars: First Assault was registered too by a company that protects domain names for corporations.
No word on what Star Wars: First Assault is, but a sequel or prequel to Rebel Assault would be neat.
