Wow. How ridiculous are some of those pictures? Garage Door? I can see it already: "Now you can burn your Garage Band tunes straight to your Garage Door!"
In all seriousness, I don't know anyone, even infrequent users, who would want to flip over the laptop to insert an optical disk. Also, by the looks of it, both the MB and the MBP have plenty of "perimeter real estate." Thus, I have two theories.
1) This is one of those all-encompassing patents that Apple wanted to get their hands on, even though they may never use it, or
2) As others may have surmised, this is for a new product.
I'm not ready to vouch for a MacBook Mini or a tablet (iPad?) just yet. Why? Seriously, check out the side of the MB and MBP... they're very thin already, and all the ports on the perimeter are laying on their sides (as to take up less height).
Let's propose this example, where Apple produces a device so small that ports consume the entire perimeter. Either this device will have 10 USB, 10 Firewire, dual DVI, dual Ethernet, and redundant power supply ports, or the perimeter will be small. If the perimeter is small, this implies the area/volume of the device is also small... likely too small for the need of a centered ODD. Thus, we can likely rule out this possibility.
So then let's consider Apple that Apple is doing one of the following: developing an ultra-portable, thinning existing notebooks, developing a tablet. The explanation above rules out the need for a centered ODD in two of these devices: the ultra-portable, and the MacBook trimming project. How about a tablet, though?
Many people would consider Apple's tablet to be much like a combination of the iPhone and a MacBook: a screen with a touch interface. The ports, then, could be positioned the same as the MacBook, seemingly ruling out the need for a centered ODD, as per the same rationale as the first two proposed projects. Imagine, however, holding this device. Either your hand covers up ports and your thumb sprawls across the touch screen, or there is a section of border designed for holding onto the deice, free of ports and ODD bays. If this is the case then Apple might just be running out of perimeter space, therefore necessitating a centered ODD.
Of course this is only speculation, but I think it adequately rules out its use in an ultra-portable or thinner MacBook. I think that IF Apple chooses to apply this technology, it will be for a tablet. I am not, however, holding my breath.
And if anyone asks me, I'd go with the iris. It makes me think of the MST3k view screen.
-Clive