You know, I actually can't find anything and may have incorrectly included Apache in the "keeping up" category. The whole Apache ecosystem almost seems...defeatist now. Google donated mod_spdy to the Apache foundation and it doesn't look like it has been touched since -- given that HTTP/2 is a derivative of SPDY, the existence of that module should make it a "relatively" (relative being, well, relative) simple change, but you're right that they don't seem to be on it.