Coincidentally, my brand new custom gravel frame was delivered to the shop on the very day that Shimano announced this new GRX groupset -- and they are already building it up with Ultegra Di2. No way am I waiting until they might ship this groupset to shops. Shoot, the RD, brakes, and cassettes are identical to 8070, I subbed in a Praxis 48/32 crankset (so, no need to wait for Shimano's subcompact crank), and, well, those brifters look nice -- but not nice enough to let a new frame sit idle for 3+ months.