I skipped the II, I'm still playing my Ultra, so maybe this is all there already.
When I buy a III I'd like a really good rotary like the Neo Vent. And the Freqout, and everything by Strymon, etc. As mentioned above, I'd like to see more easy to use prepackaged fx blocks, and more emphasis of fx development rather than just amp modeling.
It's good that users like Simeon have produced various nifty fx templates, but it would be nice if some of these more complex fx were prepackaged into single blocks with unified controls.
Also, for the synth block I'd like to be able to run a compressor block in front of the trigger signal, or for compression to be added to the trigger function. With my legato style (i.e. lazy picking) a simple level trigger threshold like the one on the Ultra is not good enough to produce an even synth trigger.
While you're messing with the synth block, add some more oscs, mods, and filters to make it more synthy.
A really good pitch to MIDI block would be great. Since the III is going to be my new DAW hub, it would be great to be able to trigger VST synths directly. Come to think of it add an embedded VST host block so I play my favorite VST synths or use VST fx onboard, talk about a killer app.
Maybe the looper can do this already, but I would like to be able to sync to an external MIDI device such that when enabled, loop recording starts and stops automatically on an even number of beats or measures.