The actual current of things is that HTTP 2.0 is what we want in the end, and SPDY is a toy to see what could be cool to add. When something that was tested with SPDY looks right, it is moved to the HTTP2 spec. I think the long-term goal is to deprecate SPDY in favor of HTTP2.

This way of development is very interesting because it enables not only to change rapidly, but also to try completely new things on a different "namespace" (ie without polluting the whole HTTP stacke already deployed)