Ya, mine updated to 1.40.1 earlier today as well. There is no info on what was included in this fairly small update, Probably just a little housekeeping before 1.41 goes final. I cannot say I've noticed any differences with my Rift cv1. All works fine for me.
i9 13900K water cooled, RTX4090, Z790 MB w/wifi6e, 32Gb 6400 ram, 2x2TB SSD, 1000W PSU, Win 11, QPro, Q3, w/Air Link, Vive Pro1 with Etsy lens mod and Index Controllers