I'd be interested in a rear rack for sure. Personally I like the look and design of the OEM rack, just wish it was metal and you could confidently put more than 20lbs on it! I run a rotopax as well and predrilled mounting holes would be awesome. Maybe a quick release system for the mount itself. I also have the Brmoto side racks installed, so compatibility with those or other systems is a necessity. Of course you can never have enough tie down points either!
Anyway just a couple ideas. Looking forward to following the development.