Age of Empires 2 HD was confirmed for the PC recently and it looks like another critically acclaimed RTS will be heading to the service.
Rise of Nations Gold Edition was spotted in the Steam database. The game was released in 2003 and was developed by Big Huge Games and published by Microsoft Game Studios.
The gold edition contains the original game as well as the expansion called Rise of Nations: Thrones and Patriots.
The one that was spotted in the Steam database also contains Achievements, so it looks like an HD remaster, although, it’s difficult to say when it will be announced.
It’s a typical old school PC RTS game. You can nuke the hell out of other cities once you reach the Industrial Age. At least that’s what I remember.