I remember reading about this concept last year, and from the very beginning I was hopeful that it would see the light of day. Now it seems Sony has filed a patent that takes advantage of 3D tech in a way that breaks new ground for Co-Optimers where 3D itself really can't: couch co-op.

Microsoft has just received a patent for an interesting feature in squad based co-op shooters.  US Patent #7559834 was filed back in 2002, but only just got approved by the United States Patent Office.  From the description, timing and pictures - it appears to be for the 4 player co-op game Brute Force from the original Xbox.