Saw the goodies in the flesh yesterday. Most of the details are already well-covered. The brake feel is much more progressive than the current set; as suggested earlier, the Servo Wave cam has been reprofiled, so the action is much closer to that of the 1st-gen Servo Wave M975/775/665. The rest of the brake system is very evolutionary.
The RD clutch (as with XTR, there is no longer a clutchless version) is significantly improved over M786/6, and much more like XTR. It's now externally adjustable, so you can easily tweak the firmness out on the trail.
Cranks are available in 1x, 2x & 3x, and also in a "B" version with all configurations, with offset rings to suit Boost 148 rear ends.
For those who still like multiple chainrings, there are an astonishing 12 front derailleur variations! High clamp, low clamp, high direct mount, low direct (E2) mount, top swing, bottom swing, side swing, 2x & 3x. Still a more streamlined lineup than SRAM's truly mind-boggling 40 variations.....
Stuff should start landing in the next month or so.