There's a lot going on in the UI right now that I can't find announcement or discussion posts for.
An edit button is now prominently displayed in the close banner (for all users, for some reason, instead of only for OP). To me, it only makes sense to show an edit button here for the OP, since overwhelmingly they would be required to edit the post to make it reopen-worthy (this one does have a few posts on MSE and MSO already, since it's such a prominent, visible change).
The summary tab on user profiles has recently changed; sections on followed and bookmarked questions have been inserted above the badges and accounts sections.
The "improve this post" link under questions and answers has been removed (is this A/B testing?). Now it seems guests can't offer improvements to an answer at all, and can't offer improvements to questions unless it's closed.this appears to be fixed/present again
Finally, there's also a new set of weird, tooltip-like banners replacing the existing tooltips on votes and scores. The first annoying experience I had with theses is that they show up instantly instead of after ~1 second (like a proper tooltip should, in my opinion).
More importantly, the content of the tooltips has changed. No longer does "lack of research effort" appear in the downvote tooltip on questions.
Maybe the folks pushing the change weren't aware? There has been a lot of strife over that requirement for questions in the Meta community. Folks involved with curation (those 'gardeners' being talked about recently) overwhelmingly support the requirement of research effort for questions, and this feels like yet another silent attempt to undermine/reverse that.
Can we get some posts about these changes somewhere? Or better yet, some discussion opportunities asking us for input on this?