The other major change to Go 1.4 is to the garbage collector. This is partially to form the basis of a fully concurrent collector that is undergoing development over the next few releases. There’s also a change to the syntax of for-range loops.
You may now write "for range s {" to loop over each item from s, without having to assign the value, loop index, or map key. O
ther changes are detailed in the release notes. This release also coincides with the project's move from Mercurial to Git (for source control), Rietveld to Gerrit (for code review), and Google Code to Github (for issue tracking and wiki). The move affects the core Go repository and its sub-repositories.
You can find the canonical Git repositories at go.googlesource.com, and the issue tracker and wiki at the golang/go GitHub repo.