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^ i think that they will be able to get nicer rims now that they dont need braking surfaces so wheels might get a better ride, but the extra mechanisms aren't exactly aero and as tester pointed out spoke counts might have to go up too. Roadies are more worried about aerodynamics than weight these days

Both will go up though. More spokes = more weight & drag. If you try and build a low spoke wheel that can withstand hub braking, then the rim is going to have to be seriously beefy. Maybe it could work for 3-5 spoke composite wheels like HED. I think they could tolerate the forces of hub braking a lot better.

Like this;

If you tucked the caliper well behind the fork leg, it should be fairly aero.