I'd also like to see more customizable weapons and ground gear, and hats, like the archer baseball cap.
I wouldn't be surprised if hats would require some kind of new "hat tech" kind of like the new "hair tech" which never seemed to materialize. Maybe for the best, though. Bigger fish to fry and all that.
But I could see that hat and Archer's shades appearing alongside the possible Risa event/adventure zone, or any other new location that is desert-themed.
I'd love to have the Morpheus-style sunglasses those aliens wore in Nemesis.