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The ability to use existing stock of I/O could save money on an upgrade,
Much higher input and output count 256 inputs and 96 outputs would be a good place to start,
RAB 4 at least, Gigabit network links required possibly?
Multi-band comps and dynamic eq’s to be available without using up FX buses.
HP & LP filters along with 4 band fully parametric on all inputs
6 band parametric on outputs would also be nice, don’t use GE’s much
Bigger touch screen that is more daylight friendly.
Retain real controls for channel strip controls
36 fader strips, and more banks/layers would give mixture of compact footprint and flexibility
Nice padded wrist/elbow rest, and wooden end cheeks[:D]