I don't believe Apple will be following through with the matte black finishes. If you go back to the release of the matte black MacBook, there were numerous cases where the black was rubbing off and showing up white. One problem was that the paint used was not up to the challenges of sweat and oils ones body produces. If you notice, that black MacBook no longer exists in Apple's current line up. Apple scrapped the idea even after the apparent "fix" with a different paint because of the hassle of it. Also, Apple likes to create hardware that looks alike. Now with the matte black MacBook gone, what would it pair up with? Apple used to stick to: White for consumer products, Metal for professional product. With the now mixing of metal and black in the MBP and the iMac, the gloss black fits right in with it.
There is another theory of mine. iPod touch anyone? With the 3G S getting video, I suspect Apple will be giving the touch a camera soon. To keep it somewhat similar and be able to use the same applications that the iPhone can. And yes, I do realize that it says "iPhone" in the photo, but you'll notice that it is showing flash brightness while all the other writing is not.
Or I could just be another crazy guy ranting about "pretty technology" 🙄