This update provides a new release of bluez which should fix several problems people encountered in 5.73, including connection issues, bluez potentially becoming stuck in a loop consuming 100% of CPU if you disable bluetooth with a device connected, and wheel scroll on some mice (especially Logitech ones) not working properly after a period of inactivity. If you're affected by any of the bugs, we recommend powering your system off entirely and then back on after installing the update - it's possible for bluetooth adapters to get in a problematic state which persists across warm reboots, a full cold power cycle should clear it.