I don't know what Korg is waiting on while Yamaha been releasing the Genos, some PSRs and now the SX900!
Korg release a new high end arranger every 4 years
They still seem to be on a very strict developments schedule
You can’t hurry those things..
Its not like they wait 2 years after development to release an instrument
And released to early, it will miss features, content and be bug loaded..
So expect a new pa5x or whatever its called in around oktober..