Double color touchscreens
With a full controll section (8 knobs, 9 sliders, 16 buttons) between them.
And 16 fully programmable (drum)pads on each side

With a full row (aka ea7) of diect controlls just above the keys..
Make it 76 and 88 keys, both arranger as well as workstation..

Step up from the old pcm samples by adding
super natural acoustic, drum and synth section
V-piano, V-synth and V-guitar sections
And expandabillity with ACB and DCB engines..

Nothing new... just technollogy Roland can allready create...

Having 2 touchscreens would definately be a step up...

This would make both synth, as well as workstation, as well as aranger people happy..