I don't understand how this is supposed to work with the 2.5W you're allowed to draw from USB, does it contain batteries and charging over a few hours?

I mean, those "snap pots" look like they can hold about 100ml of food. (assuming 5x5x4cm) The specific heat of water is over 4000 J/kg/K, if you need to heat it from 20°C to about 40°C that's a total of 8000 Joules, which at 2.5W takes about 3200 seconds, or almost an hour, even if it ran at 100% efficiency.

Since it's not available "yet" it's quite possibly vapourware intended to generate buzz. They even leave it open whether the device will ever be released - "if customer feedback is positive": http://www.fastcompany.com/blog/ariel-schwartz/sustainabilit...?

Edit: looks like others have noticed this, too.