11.1 landed today, a day late.
I think the release notes themselves are the usual list. But there's a dev note underneath about how order items get deleted now. If you've got a snippet that removes order items (a cleanup cron, a remove-free-gift hook, that kind of thing), read that note before the update. Something in how those items get removed changed. And a snippet that worked for years fails quietly, no error, the item just stays.
The wall art site has one of those snippets so it sits on 11.0.1 until Ive tested it on staging. Sounds dramatic, it isn't, it's one afternoon.
Everyone without custom order code can ignore all of this.