So beside the S2 being introed and being so much more than the S1 what is the best stuff I have been reading?

It all fits into Johnson's adjacent possible... Q

S2 Gesture & Context Catalog CSSP

AMS reading and their move into gesture.

The Roth slide #8 optical gesture will be coming our way, along with  5 more on the road map now with more that will get added as it comes up.