Usually, you don't see a lot of important new features in the initial OS updates (within a month or so from launch). Those are usually bugfixes. But we often see something a few months after launch that adds something significant, possibly something that was in the works during development, but they couldn't get bug free before the launch date.

At the moment, I think the three things I could do with added (or returned!) to the BK-9 OS are:

1) Mark/Jump for SMF's (what idiot axed that?)
2) Dynamic Arranger (ditto) Where playing harder or softer brought the accompaniment up or down with you.
3) Taking the audio loops off the keys, and allowing the FC-7 to trigger them.

Those three would make me a VERY happy camper.