Hmm, I hope Rudy Winston or Canon USA makes a video explaining how these new features work. I'm not sure what panning assist will actually do, but Canon is still not pivoting on locking users out of controlling IBIS and lens IS separately from each other. Myself and several others have reported to Canon multiple times that IBIS and lens IS on the RF 100-500, 400, and 600 don't appear to be playing well with each other in some conditions. To the point that I don't use IS/IBIS at all when shooting any movement...something that never was a problem when I had my 1DX and EF lenses. So it's a step backward.