Larry - According to what Mitch said here, if it is the same EVSE as the PIP, then it's only 120V (but could be upgradable by 3rd party solutions - Ingineer's EVSEupgrade program is pretty slick).The 120V EVSE shown at 3:34 in the video is the same J-1772 model supplied with the Plug in Prius, I know because I currently own a 2012 Plug in Prius... It's only capable of 12A 120V operation, unless you send it off to evseupgrade to be upgraded to handle 12A 240V operation (for $239)
Model S Reservation # P10010
I would doubt that Toyota would supply a built in 240V solution, no mainstream car manufacturer to date has supplied a 240V solution AFAIK with the car, it's always been extra (Leaf, Volt, PIP). Not sure about the MIEV.