I haven't done it yet. I have a big job tomorrow and don't want to risk losing anything in case I screw it up. It appears to me from reading the lists of sounds and styles added that a lot of it is geared toward newer music. The 52 free styles on the Korg website are Pop, Ballad and Dance, and can only be played using the new OS 2.0 because they use the new sounds. Probably nothing I'll use there, but you never know.
I will update the first of the week.
I do know there are new sounds, new drum kits, new styles and some added operational features.
Have you considered using the midi-to-style converter? You can select a midi file and automatically convert it to a style. Some of them work great, others not so great, but it may be worth a try if you have a good midi file that includes the genre you want.