The over-the-ear WH-1000XM6s released on 15 May, but there wasn’t a huge publicity push this time, it seems.
From what I’ve read, there aren’t any huge changes from the XM5s, just iterative tweaks to ANC and sound definition. So nice for people who need an upgrade, but likely not a necessity for owners of the XM5 or XM4 (or even XM3s)…
(WF-1000XM5s are still the latest earbuds, however.)