Pretty sure this is a "prototype" design to show the functionality. What surprises me is they haven't hit market yet - they've been talking about these for 5 years or so - we learned about these at WyoTech in '04.
The gov't is going NUTS over tire pressures - all these tire-pressure monitoring systems which are mandatory on ALL U.S. cars as-of this year. A tire like this would eliminate the need for those systems, and would save tons of money, reduce accidents, rollovers, all that stuff.
(I do agree the lack of being able to use spike-strips might be what's holding these up...)
Jeff