will all the KMA styles and performances play on the PA500?
Basically yes, though for some odd reason the original PA50 (= Micro) stuff plays better on the the PA50 than on the PA500 where some tweaking is desirable. But they all load without any problems, rest assured.
I suppose many more KMA's will be for sale when the novelty wears off.
Put it this way Bachus , and as some folks like Ian remarked months ago, it has been a terrific smart ploy by Korg. In my experience all of those who ventured out on the Micro have either retained it ( Bennie and many more not represented here on the SZ forum) or have moved on to a higher echelon of the Korg trade. (Donny: PA500, CoasterTim : PA500 , DonM : PA3X ) with several waiting in the wings.
I still have got mine though strictly speaking I do not use it a lot having the PA800 as well and the yammie PSR-s900. I still think it is incredible bang for the buck and besides where are any other novelties. The very reason that it is rather quiet on the forum is the fact that there have been no great new keyboards and also the fact that , thank God for that, we have abandonned the 'mine is better than yours ' discussions.
I for one have never ever been so pleased as with my current set up.....