THE WIND-WIND COLLISION (WWC) IN ECCENTRIC MASSIVE BINARY SYSTEMS PRODUCES PREDICTABLY VARIABLE SHOCK-HEATED X-RAY PLASMA. THIS COLLISION PROVIDES AN IDEAL LABORATORY FOR SHOCK ASTROPHYSICS PROVIDING KEY CONSTRAINTS ON HOW GAS THERMALIZES AT VARIABLE DENSITY AND ON PARTICLE ACCELERATION. JOINT NUSTAR AND XMM-NEWTON OBSERVATION OF WR 140 IN AO14 DISCOVERED AN EXTREMELY HARD X-RAY COMPONENT WHICH CAN ORIGINATE EITHER FROM A KT ~13 KEV PLASMA OR INVERSE-COMPTON SCATTERING. WR 140 WILL EXPERIENCE ITS PERIASTRON PASSAGE IN 2016 DEC. A CRITICAL TIME WHEN THE WWC EMISSION CHANGES DRAMATICALLY. WE PROPOSE JOINT NUSTAR AND XMM-NEWTON OBSERVATIONS OF WR 140 AT KEY PHASES AROUND PERIASTRON IN AO15 TO DETERMINE THE ORIGIN OF THIS COMPONENT AND ANSWER QUESTIONS ABOUT THE ABRUPT X-RAY FLUX DECREASE.