User blog comment:Bovell/Treyarch begins staffing for next project. MW3 announcement next month./@comment-2137624-20110330073526/@comment-66.169.101.69-20110330210647

Mass Effect 2 and Final Fantasy XIII are the only multidisc games I know of... And it couldn't be to add space, it'd probably be performance enhancing (less load time) because you can't fit more space onto a disc without changing the laser.