Microsoft's Age of Empires Online have surfaced at Gamasutra, with much of the information centered on the game's free-to-play business model and associated microtransaction offerings. The game will feature a Premium Civilization upgrade that unlocks all of a civilization's abilities simultaneously, as well as booster packs that add gameplay types, quests, and appearance customization items to the mix.
Age of Empires Online will launch with Greek and Eqyptian civilizations, and will be the first entry in the long-running series to feature persistent gameplay (i.e., your city will evolve and earn resources even when you're logged off). The game also boasts PvP functionality as well as cooperative play on the vast majority of its quests.
You can learn more about the game, as well as sign up for beta, at the official website.