Yes, I talked about the magical 400 ft “rule” before. For hobby operators it’s still just a recommendation to stay below 400 ft. It’s generally a good idea, but it is not a rule. Yet.
What has changed is the FAA is changing the “blanket” COA for commercial operators. The upper altitude is 400 ft, from 200 ft.
FAA Doubles “Blanket” Altitude for Many UAS Flights
However, if you are operating with a Section 333 exemption, you need to get this COA into your hands before you can fly up to 400 ft.