Currently you can run at any resolution, but you can NOT run the game in widescreen mode. The produces a 4x3 image and setting your resolution to wide screen means that the top and bottom of the 4x3 image are cropped to fit the new resolution.
What is coming is true widescreen support. That means that if you have a widescreen, you will have more information on the screen. You will see everything that is seen at 4x3 PLUS more field of view to each side. It is a true enhancement to the game.


Notice the Water tower in the second shot?
Rockdog