GSP will likely come out with the jab, establish range, and whenever Hendricks comes in with an overhand or hook GSP will duck under it, and take Hendricks to the ground with a quick double leg.
GSP will wear him down and by the third round we will see Hendricks throwing desperation overhand punches and GSP either being out of range or countering with a stiff jab that will snap Hendricks' head back every time.
GSP will continue to hit the TD at least once a round and will land conservative GnP with some short elbows making sure not to lose position and will stay chest to chest.
Maybe he eventually sneaks a hard blow through and gets the TKO, but if not he knows he'll cruise to a 50-45 decision.
Of course, Hendricks could pull a Weidman and land that big punch early on and finish GSP just like Serra did. However, I'd guess that it isn't likely.