The first release candidate for GCC 13.3 is available from https://gcc.gnu.org/pub/gcc/snapshots/13.3.0-RC-20240514/ ftp://gcc.gnu.org/pub/gcc/snapshots/13.3.0-RC-20240514/
and shortly its mirrors. It has been generated from git commit r13-8774-g1db45e83021a8a. I have so far bootstrapped and tested the release candidate on x86_64-linux. Please test it and report any issues to bugzilla. If all goes well, we'd like to release 13.3 on Thursday, May 21st.