If I'm not mistaken it is Brad Fitz HTTP2' work from the Go team and will be in the standard library in the future.

Thanks. And not really; I've seen others (like Algernon; on GitHub) around before this one. HTTP/2 barely hit the final spec a couple months ago so I expect we'll see more mainstream support later this year.

Nope, nghttp2 and h2o have been floating around for a long time now.