You know, I understand WHY everyone is saying no...but er...I don't agree with it. Do you really think that the illuminated keyboard is the reason people are buying the Pro model? It isn't the larger screen, faster processor, more powerful graphic power?
I DO think it will happen, as I suspect it will be part of the "greening" up of the MacBook. When the MacBooks go aluminum, it will gain the black keyboard. I bet they will find other ways to integrate the black from the new iMacs as well. So why not bring in illuminated keys? The only reason they wont is if they keep white keys like the Bluetooth Keyboard.
The MacBook Pros still have plenty of things that will get them a premium. I think Apple is pretty interested in creating a unified product line.