[SVTSteve]

Are you a new Ford Mustang SVO? [w/video] - Autoblog

 

[4bangin]

looks mean

they are continueing to do a great job at hiding the features of these new mustangs in the testing phase.

 

[Newport]

I don't know if it will be SVO. There are a few interesting theories kicking about. One being thats a 3.5 Ecoboost 6, compare the video posted in OP with this of a 3.5 Eco F150 and the sounds are similar enough to be similar.

3.5 EB V6 Mustang=GT350
5.0 Supercharged V8= GT500?

OR another idea thats been bandied about is the possibility that is the high reving TRinity derivative of the Coyote 5.0...

No clue really, but its big burly and important!