Sure. I'll fire it up here in a bit. I'm expecting the same support as any other Valve/Source game.
Edit:
I updated the DR with the resolutions available to me. I could not test some of the 16:10 resolutions, like 1920x1200. I fully expect the game to support it, though.
Thanks. We're actually going to adjust the requirements for 1920x1200 since those monitors are becoming less common (with 1920x1080 advancing). If we can get 1400x900, 1680x1050 tested, along with the 16:9 and multi-mon resolutions, we will assume that the title supports 1920x1200 and certify.
Issues with games supporting larger common resolutions is not common. Older titles DX7/DX8 sometimes didn't support 1920x1200 or 2560x1600. Potential issue these days is a game having a minimum res of 1024x768 and not running on 1280x720.