So the pessimist in me came up with 2 issues.
1. The M4 will be lighter than the 435 according to the interview but is he trying to be sneaky by saying a bare bones no option M4 will be lighter than a fully loaded 435? There is a big difference in weight between a no option vs. optioned out car
2. New torque vectoring technology, it's not exactly a new breakthrough is it? The current M cars (E92 M3 included) already has "torque vectoring" by way of the M Differential. So he's talking more of improving what is already there vs. implementing something completely new and amazing.
I know, i know, i'm a Debbie Downer