Been doing some research about this and I've found out that the Core iX MBPs should support up to 16GB of RAM unless Apple has limited it in the firmware. How? Few days ago I was browsing in Eurocom's site and found their latest laptop, X8100 Leopard. As you can see in the link, they offer up to 2x8GB of RAM though the price isn't nice, 1754$. Since then, I have sent them couple emails about this and they did confirm that the 16GB fully works and that their laptops use regular Intel chipsets, just like Core iX MBPs do. There are also some others offering 16GB but those are usually 4x4GB. However, he wasn't able to talk about other manufacturers so he could not confirm that it works in MBP for example. I've sent an email to Intel about this but haven't got an answer yet. So, anybody want to be out guinea pig?