What will HTTP be superseded by?
My answer to What will HTTP be superseded by? on Quora
HTTP 1.x will likely never be completely replaced, but there is ongoing work at the moment to define HTTP 2.0. The first draft of this was released in November and is based on Google’s SPDY protocol, which is already widely deployed in Google Chrome and Google’s web properties (other browsers have experimented with support for SPDY as well): http://en.m.wikipedia.org/wiki/H...
One thing that looks pretty likely is that any replacement will only work over SSL—not just to improve privacy and security on the web, but also because this is the most reliable way to avoid breaking all of the legacy proxy servers already deployed around the net.