Not sure about this one - seems to be a lot of logging and testing packages there, but that's just because everyone does those things, and many people reach for a library to help them test after coming from other languages which required it. Personally I find the built-in testing absolutely fine with table driven tests, sub-tests, I don't feel the need for things like assertions (that's what if is for !).
The logging is more interesting - perhaps a case there for structured logging in the standard library.
This is full of good news. Esp. nice that the first priority stated is to make programming easier for Go users (pragmatism above all). I like that they're looking at generics again, but it doesn't sound like that'll land any time soon. Overall a really nice thoughtful overview of what the Go team (or this member of it anyway) is thinking. Not sure I understood the immutability bit.
This looks really great, is anyone using it for a real app? It does require you to build in support for a given service though - would be perfect if someone made a package that let you self-deploy instantly to any of the popular services or VPS providers, so that users could instantly self-deploy. This was the promise of containers but it doesn't feel quite ready for that yet.