At this point the rumors and speculation are clearly pointing to a Star Wars-based massively multiplayer online game. BioWare's impressive track record, its strong collaboration with LucasArts on the critically acclaimed Star Wars: Knights of the Old Republic, and the current state of Star Wars Galaxies make this a natural fit for both parties.
When asked about how this announcement would impact Star Wars Galaxies, the Star Wars-based massively multiplayer online game developed by Sony Online Entertainment and published by LucasArts, BioWare played this one close to the vest. "No details of the actual product have been announced yet, so we are unable to comment on any impact the collaboration will have on existing BioWare or LucasArts products."
Source : LucasArts and Bioware Working Together Again