I hadn't looked at the planned changes for go1.9 until now and I have to say I'm really happy :)

- net.Resolver.Dial allows doing all DNS resolution myself, right in the same process (via a localhost port). And nice it can do both UDP and TCP.

- SyscallConn providing access to the underlying file descriptor is super useful too.

- monotonic time is very useful in network protocols.

- concurrent.Map is nice too.