We may have a better idea of what the mysterious Star Wars: First Assault trademarks were about, thanks to a purported leak from Microsoft. A collection of Xbox Live Arcade box art shows one sample box by the name with the familiar "Arcade" stripe across the top.
The box art appeared on a NeoGAF thread (via Eurogamer). If this box art leak does turn out legitimate, it may provide a time period for the title. The art appears to show the original trilogy-era Stormtroopers, rather than the prequel's Clonetroopers.
When contacted about the game, a representative told Shacknews, "it is an exciting time at our company right now, however we don't have any announcements at this time."