It's Blizzard's response to Farmville! Two budgets were proposed, one for a $200M blockbuster, and one for a $20M "Farmville-esque" browser game. The $20M budget was accepted.
(Note: This is a complete fabrication, and an older rumor regarding Everquest 3 / EQ: Next. Either way, it doesn't mean crap til there's some in-game snaps/vids)