Yep, the MKH800 Twin isn't new news and depending upon whose comments you read actually is overdue for release. Or not, according to some others.

Multi output mics are not new either. The Soundfield mics and Neumann QM69 have already been mentioned, and there was also the AKG C424 Quad, and probably others.

The Pearl ELM-A mono mic and the DS-60 stereo mic, both of which give outputs from both sides of their dual diaphragm capsules are readily available current models.