The first release candidate for GCC 10.2 is available from
https://gcc.gnu.org/pub/gcc/snapshots/10.2.0-RC-20200715/ ftp://gcc.gnu.org/pub/gcc/snapshots/10.2.0-RC-20200715/ and shortly its mirrors. It has been generated from git commit 932e9140d3268cf2033c1c3e93219541c53fcd29. 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 10.2 on Thursday, July 23th.