FYI we have started the Go 1.8 GA rollout. It will complete within two weeks (likely less), depending on a few internal factors. During this time your app may start defaulting to Go 1.8 during a deploy, if it is running on a machine that has received the GA update.
If you experience any issues, please set `api_version: go1.6` in your app.yaml. This will pin your app to Go 1.6 until you have the opportunity to make your app fully compatible with 1.8.
Once the rollout has reached 100% we will issue an official announcement of general availability and provide an updated SDK which maps `api_version: go1` to Go 1.8 when running your app locally.
This email shouldn't be treated as an announcement of general availability, it is just to provide some extra transparency around our development of the Go runtime.