Well lets see what we could determine from this vid.
1. it has a FMIC (or a radiator witch sits right at the bumper
)
2. sounds nothing like a v-8 witch leads me to believe its a TTV6
3. they would not make it a TTV8 not to mess with the new m5's sales/territory
4. they have to up the HP from yester-years model
all this leads me to believe its going to be a 450hp TTV6 with roughly the same torque
1M =350hp
M3/4 =450hp
M5=550hp
sounds about right to me.
P.S look out for shiv and terry making these things 600+whp monsters