So, see that diagram there? That diagram shows the size differences between common sensor sizes and Canon's newly announced 202mm x 205mm CMOS beast. Here's a clue, that whole black area is the new sensor, not a frame. That red area is Phase One's biggest medium format sensor. Seriously. Click it to see it larger, and all conveniently labeled.
This new CMOS is apparently being made from a 12" wafer, and the final usable area still measures at about 8" square. It's really kind of huge. Canon is also saying it works in situations with 1/100th the light as a DSLR can operate in. Can you say 'yowza'?
Like Canon's other bit of silicon bragging recently, no word when or even if this'll ever see use, more or less in what. For now, we just get to respect their mad-tinkering ways. Go go engineers!