Interoperability testing for HTTP 2.0 is set to begin later this month and the complete specifications should be completed within the year. Version 2.0's new capabilities will include such features as multiplexing providing the user with the ability to send as many requests as desired and all at the same time versus the previous 1.0 standard of only one at a time. It also includes header compression, request-response pipelining and other requested features designed to make Web pages load faster and improve API functionality and all designed to keep the 1.1 compatibility intact and functioning. At the same time, Google has been working on its own protocol, called SPDY (not an acronym), that was more or less designed to light a fire under the IETF and get working on an update to HTTP 1.1. SPDY and HTTP 2.0 are now largely the same protocols with slight differences, and Google has no intention of going into competition with HTTP 2.0. The code can be found on GitHub.
Microsoft has posted a prototype server called Katana, an HTTP 2.0 server and available for testing both in Web serving and a .Net environment.