Ran the game on two machines, both Windows 8.1 64 bit, one with an AMD HD6770 and the other one with a GTX660. Game looks mint, didn't notice any issues with it. Has surround sound as well for those with surround speakers, no ALchemy needed.
The only issue you can have since original game has it too is disappearing combat music upon load or multiple ambient/combat music track not ending/still playing at once when they add up while you cross other sections of the level. That often happens on Keegan chapter for me but probably elsewhere too. Devs stated it was fixed in patch but still occurs..