Check out mobile. I had to spend a lot of time with parents to teach them how this works after upgrade. Only to realize I did not understand recent changes - I though collections are there instead of bookmarks, but it's a collection of tabs... Really confusing for me and my parent-users. Also very easy to mess up by them.
So collections/bookmarks weirdness, menu moved to bottom, dark style, major changes on "new tab" screen. I hope there will be no more changes to mobile view in this update.
Edit: I just upgraded after I posted this. Difference? Slightly darker and forward/backward buttons don't have a circle around them. And pocket button isn't in the URL bar and I can actually remove it (and here the other day everyone was complaining about it being bigger. GONE NOW). That's almost unnoticeable (unlike Android changing the clock location) and I can remove pocket. Win?