It appears that the Nova has UMTS, judging by the above photo. That's the UMTS icon up the top. Compare it with a screen of the TyTN:
This will be my next device if true. I don't hold much hope though. If the flame, Atom Life ect are anything to go by, O2 will do something stupid and only include single band/dual band instead of including what I need : UMTS 850mhz. Please do the right thing O2!