I don't think from that you can assume the future engine is a V8-during the talk about "the past" they zoom through a 15-17' grill and explode out a 15-17' 5.0 GT engine.
THEN they cut to the future concept and start taking about the future, but do not show a powerplant..
Sadly, it looks like the Ford 500/Taurus is coming back with a Mustang logo.
Also, looks very much like an EVOS Concept front end:
Posted similar in the 7th Generation Mustang thread. I think it'd be awesome if it was the exact same system (well maybe without the plugging in) matched up with a Coyote to put down 500/650 instead but I don't think that'll happen unless it is a higher engine option. If they put something like this on the Ecoboost it would definitely be right there with the current V8.