Well nonpilot,
That version of the F-15 is just around the corner.
Helmet mounted sight
AIM-9X Sidewinder off-bore AA missile
AMRAAM missiles (which is in use)
APG-63 radar (correct me if I'm wrong)
Now, what the Eagle needs is a version of the Raptor's 35,000 lb thrust F119 engines w/3 dimensional thrust vectoring for even much better maneuvering during a dogfight. Plus the USAF should build several more airframes and implement a digital fly-by-wire system and you'll have an Eagle that can take on the latest Flankers.
Even in statistics, the Su-37 Terminator only held and 1.5 to 1 kill ratio against an F-15C, pilots being equal. So even the Sukhoi, with its fly-by-wire, forward canards, more powerful engines and thrust vectoring can't even score a lop-sided victory against the Eagle.
The US definitely has a Flanker in their hands, I can't even imagine how they would come up with tactics to beat it.
For example, in WW2, the US found a Japanese Zero ditched in an island and was sent back to the US. They evaluated it, found its strengths and weaknesses and developed tactics to beat it .
I'm a hot rodder at heart - bigger engine, more power, yada yada yada.