Yeah, it's been annound for more than just 360. And apparently Robot are no longer working on Age of Empires Online. Microsoft has given that job to Gas Powered Games.
What a mess. Age of Empires is truly dead. Not that I was excited the least for this browser online cartoon game anyway.
OT: stupid of Robot entertainment to make a kiddy cartoon Warcraft style game instead of a serious historical RTS, which they probably would have got some talent left for.