Quest 3 will get inside-out upper body tracking later this year.
Also, AI estimated legs are coming to Quest 2, Pro, and 3.
Footage & details here:
TL;DR: Quest 3 is getting inside-out upper body tracking, allowing it to track your wrists, elbows, shoulders, and torso. It will also receive AI-based leg estimation.
Upper body tracking will also let developers anchor thumbstick locomotion to your body direction, not just your head or hands, and you can do things like lean over a ledge and have this show realistically on your avatar.