Only "new" in the sense that it is currently not commonly offered, the devices themselves have been available for ages. (If you are a large enough customer you apparently can get at least some colo-facilities to provide you with the roof-access and cabling needed for the antennas). If cloud providers make precise time available I don't see much potential for locking you in with their specific way of providing it, as long as it ends up as precise system time in some way.
Only "new" in the sense that it is currently not commonly offered, the devices themselves have been available for ages. (If you are a large enough customer you apparently can get at least some colo-facilities to provide you with the roof-access and cabling needed for the antennas). If cloud providers make precise time available I don't see much potential for locking you in with their specific way of providing it, as long as it ends up as precise system time in some way.