The new cables have the mic separate from the controls. Meaning it will have a smaller mic "thingy" in the cable around chin/neck area and then youll have the other bigger thingy for the remote at the lower part of the cable.
As far as stretching the headband, I have a rather normal size melon so I had no need to.
Btw, here's my current setup:
White Pearls, FiiO E6, Samsung Admire