You knew it was bound to happen sooner or later — Farmville is heading for the iPhone. But that’s not all, Activision was also on hand at WWDC to announce an iPhone version of Guitar Hero, which packs classic rock from the likes of Queen and The Rolling Stones, and is available in the App Store today for $2.99. Check out a shot of it after the break, and look for Farmville to be available by the end of June — or don’t, it’s up to you.