We just released Go 1.6.
You can read the announcement blog post here:
https://blog.golang.org/go1.6
You can download binary and source distributions from our download page:
https://golang.org/dl/
To compile from source using a Git checkout, update to the release with "git checkout go1.6" and build as usual.
To find out what has changed, read the release notes:
https://golang.org/doc/go1.6
Thanks to everyone who contributed to the release.
Chris