Just came across a bit about this prototype wheel in a GCN video. Hopefully the link below goes to the right section but it's about 6:00 in.DutchMountains wrote: ↑Tue Jul 31, 2018 1:34 pmfrom cyclingtips.com:
"[Hunt Wheels] were walking around the show with a prototype disc-specific aero rim in hand. With a former aerodynamics engineer from Campagnolo now on staff, this 48mm-deep rim was optimised for use with a 28c tyre. The 22.5mm internal width is a far cry from the 35.5mm external width. But instead of adding redundant material mass at the edge of the rim to make up that bead thickness difference, Hunt has a new patent-pending technology that uses a resin filler that’s a quarter the density of carbon fibre or similar structural material. The design is said to save 50g per wheel while providing the ideal aerodynamic properties. Such a design is only made possible by the use of disc brakes and is just the sort of innovation needed for discs to be widely adopted in races. The new wheel is expected to be out by the end of the year."
There is no further info on the Hunt website (yet). Also, AFAIK Hunt has up until now only used/rebranded existing rims (like the Kinlin XR31) so it would be interesting to see if there will be a manufacturer in the far east offering a rim with the same specs.