New Core 2 Duo Processors

So I just read that the new Core 2 Duo processors are going to be 64-bit processors. And Windows Vista is supposed to be a 64-bit OS. So how can our Macbooks run Windows Vista using the current Core Duo processors? Now that Macs run Intel chips can we switch out our current Core Duo processors for the new ones?

we cant switch our CPUs they are soldered in... you can with imacs (and minis I think) though and yes, vista is already supported with bootcamp, and u can use it's 64bit advantage

Vista has a 32it version.
^^ as said MacBooks solder in their CPU's so you can change it unless you replace the entire motherboard