Google it. Seriously, I found a couple of power point presentations given by consultants that explained a lot. It seems that new maps will be issued, like you said. Category IIi and IV will have their own maps and, I could be mistaken, category II and IIi buildings will have their wind speeds reduced slightly for most areas not along the coast.
Most of the changes in ASCE 7-16 deal with the seismic provisions. The Fa and Fv factors are overhauled as well as some site class classification issues.
The code will better clarify requirements for performance based designs and designing for fire. It also eliminates all those forsaken foot notes under the live old tables (NOW ONLY IF THE IBC WILL FIX THE FOOTNOTES UNDER THE DEFLECTION CRITERIA!).
