Several companies were displaying dual capsule mics where each capsule had it's own output (multi-pattern mics use two diaphragms but mix the result into a single output). This enables you to manually change the pattern either while recording or when you're mixing.
I don't know how practical dual out mics will actually be since we've been getting along just fine all these years without this ability, but it's nice that mic manufactures are thinking outside the box.
