Tested the new firmware with one flight and my impression was that the yaw drifts issues was reduced but NOT removed.
I got one yaw drift a couple of minutes after take off but it never repeated during the remaining flight.
When I started moving forward after the yaw drift it was moving in another direction than the camera was facing as before, maybe 15° off or something. But when I started flying forward it moved back the camera during 5-10 seconds so it was facing forward again.
It could be luck with just this flight, I don't know yet.
I wish I could say that this was all I noticed, but sadly the Occusync update caused issues with the controller dropping control signal.
First it happened right after power up, had to reboot to solve that, the next time it happened was at the end of the flight with the P4 a couple of meters away, it said lost control but I could control it.