Blizzard's upcoming casual MMO, code-named Titan, are incredibly scarce due to the developer's ironclad secrecy, it falls to enterprising fans to ferret out any scraps of information that may exist. One such player on the NeoGAF forums was combing through a Blizzard job posting for a Franchise Development Producer and noted an interesting line that indicated the studio could be mulling over the idea of in-game ads for its next MMO.
The line in question specifies that one of the duties of the position is to "work with major consumer brands to facilitate product placement and licensing within the world of Blizzard Entertainment's next-gen MMO that enhances the gameplay experience." Whether this is a sign that we'll be seeing billboards for Skittles while we raid or that players will be able to get endorsements and decorate their outfits a la NASCAR cars is anyone's guess.
It's important to note that the rest of this position entails a number of efforts to promote Blizzard's "next-gen MMO" outside of the tight-knit gaming sphere, including comics, action figures, and short movies.