I have no clue as to the reliability of the source, but we have a report that Lockheed Martin will be offering the F-16 with a supercruise capability to India for it’s massive mid size fighter purchase.

I would assume that this would involve a growth version of either the F-100 or F-110 engines, probably the former, as it is lighter, and possibly some aerodynamic tweaks.

I also know that a clean F-15 exhibited low supercruise (below Mach 1.2) nearly a decade ago in a clean (no external stores) configuration.

I’m a little dubious of the report, there are a number of errors in the article, it states that the F-35 supercruises, and implies that the Typhoon does not.

Additionally, the F-16’s wing configuration tends to be draggy in the transonic and supersonic regime, and for meanigful supercruise, this ability would have to be exhibited while carrying at least 4 air-to-air missles, 2 on the wing tips, and two under the wings.