Since the Nikonos lenses were designed for the 35 mm format (36 x 24 MM) and they are being mounted on a M4:3 sensor (18 x 13.5 MM or smaller) it appears to me that the 15 mm Nikonos lens AOV would be reduced from 94 degrees to 47 degrees and that the rest of the Nikonos lens lines AOV would also be reduced by the same X2 crop factor. Is this in fact the case?
The AOV of the 15mm lens WILL be reduced, from 94 degrees to somewhere around 58 degrees. This ratio is a little different from the crop factor because the AOV of a rectilinear lens changes with twice the arctangent of the sensor size divided by twice the focal length; putting the arctangent function in that equation makes it extremely nonlinear, so halving the sensor size doesn't halve the AOV.
We are also making adapters that will hold the lens 4mm closer to the sensor, which will increase the AOV by various amounts. They will work like the opposite of an extension tube (extension tube decrease the AOV and icnrease the magnification, the reducing adapter will increase th AOV and decrease the magnification). This is a rarely used optical trick that only works on short focal length lenses being adapted to a smaller lens mount in a format that uses a smaller sensor.
I haven't tested the 12mm Sea & Sea fisheye lens, but I expect it to have a fairly wide FOV, especially on the reducing adapter. An angle of view of around 130 degrees (equivalent to a 10mm rectilinear lens in air) seems likely, but I don't know the exact distortions imparted by the Sea & Sea fisheye.
Also since these lenses are all manual focus lenses do they allow the in focus green dot to come on when focus is obtained?
I haven't been able to get the EP1 to reliably show the green dot with manual lenses. I've been focusing by looking at the screen to check the focus. I've also checked the focus by using the info mode where a press of the "OK" button magnifies a window of the screen by 10X. If you're interested in the behavior of the EP1 with manual lenses, there are many people using the EP1 with Leica lenses.
also will this housing have a port mounting system as well so that the M4:3 lenses can be used like the old SubEye film system that could use both housed Nikon lenses and the Nikonos RS lenses with an adapter?
No, it won't.
I haven't seen the SubEye system, but I would be fascinated to take apart that adapter. As I understand it, the RS lenses don't use the standard Nikon F-mount mechanical controls for focus and aperture, so an adapter would need some swiss-watch style linkages to transfer motion.
As for ports for other lenses (like the four-thirds 8mm fisheye, the 20mm f/1.7, or the 50mm f/2.0 macro), we're not offering those, at least not in the first run of products. Our goal is to add a new capability to the marketplace: the ability to take digital pictures through Nikonos lenses. We don't have much to add to the products that let you take photos from behind ports. In the future, we might add a product that lets you do both, but that's not the focus right now.