OK, here goes a few...

A combination of arranger AND arpeggiator functions. Two totally different things, combined as one. Best of both worlds.

More Variations (say six), more Fills (one per possible destination, that would be sixteen for a four Variation arranger), and a break/fill for every Variation (Ketron already got that one!).

Styles grouped according to which ones can be switched to on the fly, seamlessly. Say ten styles, all stylistically similar, same orchestration of the rhythm section, but with different horn, string and keys parts. But same pocket for them all.

The return of the Swing value knob. Take a Straight 8 all the way out to overswung and back, with a LOCK, so if you change styles, the same swing value gets imposed. New Jack to rock, same pattern...

Audio drum loop capabilities (like Ketron), but with a 'match groove' command, so MIDI Parts get adjusted to the groove of the audio loop (computers do this easily).

Some kind of Looper (OK, OK, you know I'm talking about the return of the Chord Sequencer It's just that I want to be able to play my trombone without using a bloody SMF again!).

Front panel switches completely reconfigurable. WHAT you want, WHERE you want it!

A 'cue mix' output pair, with a variable 'more me' knob, so you can hear what you play nice and clear, but main mix is more balanced.

OK, keep them coming...