The first release candidate for GCC 12.2 is available from https://gcc.gnu.org/pub/gcc/snapshots/12.2.0-RC-20220812/
and shortly its mirrors. It has been generated from git commit r12-8684-g6b7d570a5001bb. I have so far bootstrapped and tested the release candidate on x86_64-linux-gnu. Please test it and report any issues to bugzilla. If all goes well, I'd like to release 12.2 on Friday, August 19th.