Yes, I was just about to report the same thing. The editor toolbar is different, and I can't find the button to turn off WYSIWYG (sorry, I can now - it just looks different). Trying to post a URL hasn't worked.
Something changing must be evidence of af123 in the background, I would think, but I don't like change for change sake - there was nothing wrong with it.
I have been unable to discern a pattern so far, but I have a store of useful links I can paste into a forum post - and sometimes that isn't working now. The link just ends up with the text and not the linked URL. If I fix it manually, the result looks exactly the same as what I pasted in the first place.
(on a wide screen in Win7/Chrome now) I get a drop-down with "Insert horizontal line", "Spoiler", and "Code" on the dots next to "Insert table" (it seems a regression they are using sentence case rather than title case).
I notice the strange icon in post 10 (iOS/Safari) isn't present in the Win7/Chrome version.