Got the 11 on my Galaxy 10 a few days ago. A couple of things:
Battery seems about the same, but now, in the section that shows how much battery which apps use, something called CALL LOG now appears, and it appears to be using a considerable amount of battery. When I click on other apps in that list, it shows details, but if I click on CALL LOG, nothing happens. And there is nothing in my APPS list in settings that shows anything that says CALL LOG (tho the icon does show a phone, so it must be there somewhere). This app (if that's what it is) never appeared on previous versions.
The Always-On-Display is acting differently. Used to be able to swipe left on it to get the current temp...now does not do that. Occasionally, if I swipe down, I will get something like a notification window with weather details along with some other stuff, but this doesn't always work.
When I am using an app and I get a notification, it will pop up at the top of the screen. If I click on it while it appears, it will open in a small window over my current app with the app that has the notification (if you follow that). However, there is no way that I have found to get rid of that window, other than hitting the home button and, even then, an additional icon appears on the home page, and I can't get rid of it!
As for renaming the photos, other forums say it has been removed intentionally. The only way to do it now is though the My Files folder, which is absurd. Maybe they'll bring it back, but I doubt it.
I'm sure there are more minor glitches that will eventually be patched, or, maybe I just don't have a clue as to how they work.