Not true. I was able to `aptitude update` and `aptitude full-upgrade` before 10:00 AM EST (9:50 AM) and received the new php8.* packages and upgraded fine.
Anyone using a non-default version from the semi-official PPA by Ondrej Sury is still waiting for an update.
The launchpad server is throwing 503 errors all over the place, so that's probably the reason for the delay. Sury's own repo has the fixes all right.
Still no update for ubuntu 20.04 which has support via ESM, even though the patch is available for php 7.4. There are a lot of people using older servers which still have ESM support.