I’m not sure that this qualitifes as new technology. More like existing technology being used for trains.
What this really does is replace the rail as the command signal carrier with a radio wave as the command signal carrier. The power source can continue to be the rails or it can be a battery. (or live steam or gas motor or whatever). Some kind of unit is required in the engine to receive the signals sent, then respond - first identifying if the signal is for it and second what to do if it is.
The advantage is that the system can work with batteries instead of the track as the power source thus reducing wiring and track cleaning problems. Of course if you’re using the track to activate a signalling system you lose part or all of this advantage.
The first disadvantage is you have all these batteries to fool with - recharging for the next operating session, swapping out if they run dead during a session, replacing the batteries, finding a place to haul them around with the engine, etc.
The second disadvantage is fitting a receiving unit in the engine making sure that the radio signal can get to it - a possible problem with metal engines/tenders.
The third disadvantage is the lack of standards. Some of these piggy back on DCC and others don’t. But there is no standard for the radio part. So you won’t find Bachmann, Atlas, etc. producing these factory installed. And if the system you pick goes out of business, you’re out of luck.
Fourth, with battery power, a derailled locomotive will continue to run through the scenery, right over the edge of the layout, etc.
Since the in locomotive part has to do more, it will probably be more expensive than a straight DCC decoder.
Is this the wave of the future? Probably not. It doesn’t really introduce any new capability. For an outdoor layout with track cleaning, voltage drop, and safety issues, it may be a goo