[Edit] The page was showing "We’re still preparing the notes for this release, and will post them here when they are ready." 5 minutes after the URL got submitted, a placeholder text.
It's already live, maybe it's just your nearest PoP caching it?
Edit: I've indeed checked the time when it was published, but it seems that it's already live around two minutes before the OP posted this (so you may just hit an unfortunate caching incident)