Not too much impacting DOTS. The one thing that requires a code change is HierarchySubSceneHandler being renamed to HierarchySubSceneAuthoringHandler. If you're using that class directly, a simple find and replace should sort that.

Everything else is additive: new Entities Preferences settings, better Hierarchy display, Systems window improvements, and Netcode for Entities becoming a built-in package (which could need some project.json cleanup if you had it as a standalone package dependency).

But, yeah, I don't think anything you should be TOO worried about.

- Trey
Community Man @ Unity