I'd love to see;
the Healing Tool work in 16 bit as quickly as it did in PS7
USM join the 21st century, apart from the preview has it changed in over a decade??
The File Browser to take another big step forward & be an even more productive tool - more integration with ACR & batch processing, (& it would be nice to be able to leave it open and work faster than a snail)
An option to enable the Batch Rename command remember the last number it used
the 'blend if' sliders come out from hiding
a continuation of PS's 'photo quality' effects (such as Lens blur), how about some believeable film grain?
I could go on, but I guess I'd be happy if I just got the first one