This was definitely a "shut up and take my money" moment when I saw it pop up on Steam. I've already pre-ordered it and can't wait to play it April 9th.
Today Microsoft Studios is excited to announce the development of Age of Empires II HD The Forgotten; the first new official expansion for the Age of Empires II universe in over ten years. Challenge friends with five additional civilizations and technologies, battle through four campaigns, vanquish opponents in new game modes on massive maps, or shoutcast a match and stream it all through twitch.tv.