I'm also calling this fake. Why would Apple believing that "all laptops are going this way" (referring to the ultra-thin Air design) choose a non-standard jack that is so (relatively) thick/tall? If lightpeak is optical, optical can be pushed through a frighteningly tiny amount of space (meaning the port could be relatively tiny, even if you run some copper along side the optical to cover the need for powering peripherals). Optical can be vertically thinner than the relatively thin port sizes such as USB.
The port for "thunderbolt" (lightpeak) in that image looks like it could be as vertically fat as full size USB port, which doesn't seem to be compatible with the drive to make everything ever-thinner at Apple. It seems like it would only be a short time until the thunderbolt port could not fit on the side of the laptop case anymore (too thick). And if this port is going to be the "everything" port, how do you make it fit onto an iPhone, iPod, iPad, etc (and with the idevices, note that Apple chose the current thin & wide port design for a reason that this speculated port seems to forget)
My perception would be that if Apple is going to drive the design of the port itself, they would choose to make it very (vertically) thin (and wider if necessary to accommodate a thin vertical profile). I would expect something more like mini-usb or micro-usb (even SD media card slot thicknesses) rather than something that is as vertically fat as mini-display port. I would imagine measurements of just a millimeter or three max, not something close to a centimeter+.
How many generations of the "Air" are we from ports like mini-display port and ethernet being too (vertically) thick to fit anywhere on the sides of the case?