User blog comment:Callofduty4/Robert Bowling hangs out on Google+, reveals DLC info/@comment-1854594-20120324013302/@comment-1854594-20120328092705

The Prothean character can be purchased for an addition ten bucks. Other then that don't believe so. Oh, and don't look at the art book, I've heard alot of complaints from people saying they looked at that right away and spoiled most of the game like seconds after opening the packaging.