Go 1.2 is on target for a December release and the Go team have just cut their first release candidate.
You can find the draft (no twitterverse, Go 1.2 isn’t released yet) release notes for Go 1.2 online here.
I have updated my unofficial ARM tarball distributions page with prebuilt go1.2rc1 tarballs. You can find them by following the link in the main header of this page.
If you are interested in following the performance improvements in Go 1.2, you may be interested in my autobench project.