All resolutions natively supported. There's a 'Widescreen' checkbox in the display options but it's only a 4:3/16:9 FOV toggle really :
- 16:9 is strictly Hor+
- 16:10 and 15:9 are 16:9 slightly squashed
- TripleHead is 16:9 massively stretched (sorry, no screenshot at this time, just stretch the 16:9 shot to a TH resolution to get the idea.) 5040x1050 is unsupported, too (DX10-only game).
As much as I find lackluster widescreen support depressing, I must say playing Stormrise in 16:10 with a forced 16:9 FOV feels ok. Lack of TH support is the real big issue here imho.
4:3
16:10
16:9