Don't know where you're getting your info but the USAF (pentagon) has repeatadly rejected the GE F136 as the alternate engine to power the JSF, F-35. I'm unaware of any new or future application that would need an engine in the thrust class of 5th or 6th generation fighters similar to the F-22 or F-35.
I believe the next new fighter will be something in the order of an RPV or perhaps a convertable piloted RPV as we're starting to see in the aerospace pubs. If this is the case you're looking at something in the order of 25K lbs thrust in AB. Something like the GE F404-414 in the Super Hornet, and carrier capable.
Another possibility would be upgrades to the legecy fighters such as the F-15K becoming the F-15SE. This makes a whole lot of sense to me and ought to be considered by foreign customers as the price of the F-35 continues to grow. With the SE you have frontal stealth, (read first day of the war mission) but an aircraft that has so much capability. It would not replace the F-18's as the F-35 is supposed to do but that problem is solved simply by buying more Super Hornets.