One thing I picked up on, which I haven't heard discussed here yet, was Carol Marcus' comment that Adm. Marcus had been dabbling with transwarp technology -- and hence why he could easily catch the Enterprise. Very nice homage to the Excelsior, and a "what could have been" it it had been designed for nefarious purposes.
Huh. Didn't think about that before, but maybe this is what Esteban meant in III when he mentioned Kirk was wrong thinking he could get away with warp drive. Khan's line echoes this quite nicely.
Vengeance is the Evil Excelcior.