Remote ID is the biggest recent change. As of March 2024, all drones over 0.55 lbs flown in the national airspace must broadcast Remote ID data — the drone's serial number, takeoff location, and current location in real time.
For 5-inch FPV quads, most don't have built-in Remote ID, so you need a Remote ID broadcast module. Popular options include the Pilot Institute RemoteID module (~$30) and Dronetag Mini (~$55). They attach to the frame with a zip tie and draw power from the main battery or a small dedicated cell. This is a hard legal requirement as of the FAA's enforcement date — not optional, not a suggestion.