I'd love to see more innovation on the style engine, things like FULL audio styles and KARMA integration come to my mind
I'd love to see more controllers added, ribbon controller, vector stick, Pad touch sensitive drum pads, D-beam..
I'd love to see full fledged master keyboard functionallity
I'd love to see Articualtion voices or even other synth engines like VL added.. I.e. a KRonos version of an Arranger

My major gripes with the poll list is that there are only things on the list allready available in current arrangers.. While arrangers need (in my opinion) to evolve to the next level with new features..