Unfortunately, 13" is definitely too small for me (in terms of ergonomics). Are you planning on releasing models with a larger (and matte) screen in the future?
Also, could the keyboard "module" in theory be fully customized by the community (so as to support ergonomic layouts similar to ErgoDox, include a trackpoint etc.)?
Finally, why only 4 expansion slots? AFAIU there's no Thunderbolt card(?) yet, so I need every USB slot I can get my hands on and 2 (4 - 1 HDMI or DP slot - 1 PowerDelivery slot) would definitely not be enough!