Ummm... the new one is in widescreen....I have it right now.
Larger than 1920x1200 would be cool. The price of monitors has come down so much over the years that people are picking up sizes larger than 21'. I use a 27' with a 16:9 ratio. Finding wallpapers for anything larger than 21' is a huge pain. If Bethesda would release the PSD for the Skyrim wallpaper(s), I'd be willing to do the resizing, but I don't for see them doing that.