I'm not disinterested, though $350 is a little steep ($450 if you're not an 'early bird'). Ideally it would be bootloader unlockable and rootable as well. I would probably use it like a PDA of old.
Yeah, licensing fees are super high. Who knows what kind of battery life and displays we might have on our personal devices today if eink wasn't so encumbered.
Because e ink is basically perfect for bus stops. You don't need to update more than once a minute or two and it uses basically no power for running 24/7.
They can't claim carrier compatibility yet before they even source the parts. (They're in Japan right now sourcing Chinese parts, allegedly, and only have renders thus far.) Let alone until they have a working prototype to test against fyi.
Carriers may very well not certify the device due to compatibility issues. Or they won't be able to afford the certification process.