Sterne Agee hinted at on Gamasutra recently.
Arvind Bhatia is quoted on the game industry website as saying that Blizzard's product pipeline includes "expansion packs for StarCraft and World of Warcraft, a new Diablo game, [and] a new casual MMO." That casual MMO is of course Titan, the secretive WoW followup that has reportedly gobbled up Blizzard's most experienced designers.
While no one outside of Blizzard has any inkling as to Titan's setting, mechanics, or target audience, Bhatia's prediction makes a certain amount of sense given the realities of the MMO marketplace and the costs inherent in developing and marketing AAA titles. Head to Gamasutra for the full report.