Actually, after graphite (like POG or PS6.0), they got the super hard arm breakers (graphite plus a whole bunch of other material to make it stiffer than anything). The super powerful sticks are a break thru IMO.
The next round of break thru would be keeping the high power but up the control and feel, with the help of new strings, etc.
But I do not believe every 2 yrs when they bring out new sticks there are actually new techs. Most of the time they just play with the power/stiffness/weight distribution/material compositions like with sliders to give it a different feel