I work for Google on Chromium (primarily networking stuff, like SPDY). You can see my comments on this matter here: https://groups.google.com/d/topic/spdy-dev/ipTmn5ty_n0/discu....
"Our plan is to continue what we've been doing: experimenting with new ideas in SPDY and recommending the good ones for standardization in IETF (http://tools.ietf.org/html/draft-mbelshe-httpbis-spdy-00). In the end, we only want one protocol, so we don't intend to keep a SPDY track alive longer than a successful standards process."
Out of curiosity, what changes from Speed + Mobility would you like to see in SPDY? We'd love to hear your recommendations on spdy-dev@googlegroups.com.