I think they want to provide a next-gen experience on many levels. A fresh take on gaming. I don't think we should restrict our thoughts to one "gimmick". Good Nintendo systems offer multiple innovations.
SNES offered 16-bit processing, thousands of colours, synthetic symphonic music, four face buttons, triggers and mode-7 3D. N64 had true polygons, 4 controllers and analog sticks. Wii had motion-sensing, ir aiming, and the virtual console.
I think NX is going to offer AR and a new take on motion sensing gaming that will incorporate next-gen Wii-motes, a motion-sensing camera and possibly AR. I think they will combine this with tablet portability and the option of connecting the SCD to allow for traditional core experiences on the TV.
I think they are going to try to repeat Wii success with an affordable, accessible, innovative system. I think the SCD twist is an attempt to placate the core gamers, the 50+ million or so who bought the Wii when it was fresh tech but then ditched it for PS360.
