Tools:

cmd/go: vendoring enabled by default (https://golang.org/cl/13967/)

Ports:

NaCl is no longer restricted to pepper_41 (https://golang.org/cl/13958/)

API additions and behavior changes:

strconv: QuoteTOGraphic (https://golang.org/cl/14184/)
text/template: ExecError (https://golang.org/cl/13957/)