Nah, 499 is D26, so that means D25 has to be MMS489.
And it's probably the Mark 46 concept from Civil War that was shown at SDCC, considering MMS488 is Captain America concept.
Just to add fuel to the speculation, DieCast D25 is still missing too, and the only place it could go is MMS489.
The full product code will be MMS489D25... speculate away.
Chances are it will be an Iron Man though.
