Originally Posted by IEDEI
the M135i has the same e-diff as the E82 135. No LSD available. Perhaps they will offer it as a port-installed accessory OR people will just have to delve into the aftermarket as they have in the past.
EDIT: oh this is the interview you must be referring to:
It will most likely be a M performance part, either installed at port or dealership. Either way it will be available, just like it will on the 435i soon.