2.5.1 Migration Guide
5.1 Has dropped the Oculus and Steamvr modules, you will want to be only on OpenXR ideally on this version.
Enhanced input will soon be the required input method in engine and it is preferred to migrate to it now.
Chaos is finally gameplay useable, though it still has some potential issues.
The GraspingHands attachment proxy components are not longer being spawned in live and are instead constant components on the character. This is to work around a current engine bug. Anyone updating to 5.1 from earlier versions would want to reference or enact this change (or remove proxies if you never expect to have off scaled grippables or climbable objects).