The roadblock to UAS integration so far has been the lack of autonomous sense-and-avoid systems on the drones, and the unmanned aircraft flying in the bubbles won't have it either. Instead, ground-based sources of traffic information, like ATC radar data, will be transmitted to the drones which will, in turn, relay it to the ground-based pilot. The pilot will use the information to maintain separation. Later tests will involve semi-automated sense-and-avoid systems. There's been no decision on where the test areas will be located but it's likely at least some of them will be near existing UAS test areas.
This is a companion discussion topic for the original entry at https://www.avweb.com/news/drone-tests-to-expand