The first release candidate for GCC 11.3 is available from
https://gcc.gnu.org/pub/gcc/snapshots/11.3.0-RC-20220414/ ftp://gcc.gnu.org/pub/gcc/snapshots/11.3.0-RC-20220414/ and shortly its mirrors. It has been generated from git commit r11-9879-g53254184bda630. 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, I'd like to release 11.3 on Thursday, April 21th.