I remember Elf saying there was an F-15 2.0 in the works, possibly around the time of the A-10 game, but both were cancelled shortly after Jane's F/A-18 release.
Other than that, Jane's F-15 was the last commercially released F-15-only sim. LOMAC had the F-15C, released a few years later, but its loading screen was the one with the guy in camo with his back to the camera directing the plane. WoE has the F-15A, but its loading screen is just a pair taking off.
That's it for combat sims with F-15s. I would've loved to see another Strike Eagle sim, but Jane's was the last one.
I'm thinking the loading screen you remember seeing way back just doesn't show anymore because your PC now is far more powerful than what you had back then.