Even if we wanted to, we can't (rather, shouldn't) play Age of Empires all day. This summer it'll become a time-sinking possibility, however, with an AoE spin-off headed to iOS, Android and Windows Phone. The teaser video dropped by Microsoft doesn't reveal much outside the broad release date. Age of Empires: World Domination only gets mere seconds of gameplay teased so it's hard to derive exactly how much depth the mobile iteration will go into. Fortunately, horses, spears and Huns, at least, have already made the transition.
Update: We've edited this article to reflect the fact that the game will come to Android and WinPho, as well as iOS.