Version alpha1 is planned to be released this week. It's still in development and will enter soon in the stabilization phase for the developers, and the test phase for the users.
RPM of this upcoming version of PHP 8.3, are available in remi repository for Fedora 37, 38 and Enterprise Linux 7, 8, 9 (RHEL, CentOS, Alma, Rocky...) in a fresh new Software Collection (php83) allowing its installation beside the system version.