I wouldn't buy it just for the Audio styles. No telling when, or if, they will offer more. . . and at what price.
The combination of the improved vocal harmonizer, the improved drums, the bigger speaker system, the size and weight, the price point AND the audio styles make a pretty good package though, particularly because I'm looking for a backup for my PA3X.
I strongly doubt it will make me move away from the Korg, but who knows . . . we'll see. It is truly wonderful to have so many great choices!
DonM
P.S. I do anticipate selling my beloved Roland E50. It is still a great keyboard though, and I will probably regret that too.