Korg took the PA1XPO as far as they could...they are out of memory for any upgrades. And a lot was done...all OS upgrades for free! Funny..I never got a single new feature in my $3500 T2???
Like I said before...these mfg's can do a LOT of free upgrades IF they put enough into the hardware in the first plac...if they skimp...then less can be done.
Of course there will be a PA3, but I think the upgrades will still go a long way yet on the PA2.
In reality, when you buy one you can't count on any upgrades...so far Korg is doing bettr than anyone else in this area...and they say MUCH MORE to come...we will see.