One thing that excites me the most is the hackability of the "included" case. Enough room for a battery, supercap, switches, normal HDMI ports, and still having free of clutter the GPIO pin rows.

I could also expect a 3D printed detachable LCD bezel/case connected directly to the microHDMI port and GPIO power rails. But well there are already some raspi based laptops for that matter.

I still like the R400 as a "presentation keyboard". Battery pack and HDMI adaptor and it's connected to the classroom projector.