It's about time!!!
I read a report on these almost 20 years ago in an AutoWeek article. At the time the cast plastic hub had a replacable rubber ring pressed onto it. Very similar to these units.
This will open up the parameters of tire/wheel design considerably. When the article was written, the tire company had an Escort with 4 prototype tires on it. The invited a bunch of competetive drivers to test it and let the Pro Ralley guys have it last. They found a back road and came back very impressed. I recall one of them saying that they hit things that would have destroyed 2 of the tires if they were pneumatic, the prototypes wern't damaged at all.
As for load capability, no problem.