Online documentation for UIv4?

To clarify the above, when I said "and it looks to me like the page is still for UIv3" ... I meant the documentation page.

Also I did see the note at the top about the up to date content, the page admits its legacy, but if you follow the link, its just a list of report types. No explanations, no screenshots, nothing that breaks down, explains, or even displays the new UIv4 at all, not in the first 2 or 3 reports I looked at from that linked page.