You should file a separate bug report against mountall about your specific issue with /proc/bus/usb, and post your exact fstab entry; there's no reason to think this should be a release notes item as opposed to a simple bug in mountall that we should fix.
(Does mountall not give you any option to stop waiting for /proc/bus/usb when this error happens?)
Vaibhav,
You should file a separate bug report against mountall about your specific issue with /proc/bus/usb, and post your exact fstab entry; there's no reason to think this should be a release notes item as opposed to a simple bug in mountall that we should fix.
(Does mountall not give you any option to stop waiting for /proc/bus/usb when this error happens?)