Yah, we didn't want to rush it and end up stuck with a subpar package in the standard library.
If you are at GopherCon, I'll be giving a lightning talk on Saturday 11:40am on things I've learned by contributing to fsnotify and other open source projects. Happy to chat more about fsnotify afterwards.
The code is identical on GitHub and Google Code right now. The difference is that we may make breaking changes under go.exp while leaving the howeyc/fsnotify API as is.
We're still figuring out what os/fsnotify will look like.