At SEGA's event called Gamer's Day the company just announced that the PC RTS game Universe at War: Earth Assault will also be coming to Xbox 360. The PC version is currently planned for a release in Q3 2007 and is being developed by Petroglyph.
More details on the Xbox 360 version haven't been announced, yet. In a few hours we'll have more details and maybe some images from the Xbox 360 version.
It appeares the game will be released on Xbox 360 in Q1 2008. It's an RTS game which is themed around a near-future Earth under siege by aliens. Off course, there is an control-sheme built from the ground up for smooth playing for console gamers.