What would be nice and definitely possible::
1. Fix all existing bugs (env decay problem, 'folder error' saving to flash, observed crash/freeze situations)
2. Fix dubious new changes (can't start/stop quickly anymore, tripleclick stop button resets all module patches

)
3. Add all the same improvements that 2.5k is getting. After all it'd be a small effort for Akai to do that. (obviously they can leave out grid edit, chop shop etc.)
What I'd really like but i bet wont happen::
1. sample 'on the fly' ie. record a sample, map it to pad and play it.. all without having to stop the sequence
2. actual pitch envelopes (they aint there, are they?)
3. true sample-accurate timing (not gonna happen

)
4. auto-chromatic. (so easy to program but they seem to love not putting that in

)