gasdive: I've been suggesting something like this for a while, but without the central lens. If you had something like an iPad but with the whole back coated with close spaced cameras. You could fit about 2400 cameras in that space. Then with some processing you could do things in post like 3d with variable intraocular distances, variable effective aperture, refocus after shot, variable depth of field,variable point of view, pixel drizzel hyper resolution with stacking for increased effective iso and reduced noise. All these artistic decisions could be made *after* the capture.
I hope you know how much of an overestimation you're making. You're doing a downsampled, polyphase filtering and some of those methods you're talking either does not make sense (intraocular distances) or will need additional physicality sensors or you will need to alter the surface shape on which your cameras are placed.
I hate to be a pessimist. Good news though is military development is far ahead of what you can imagine. This gigapixel camera is old news.