I may be right in thinking that in the Windows world, Merom will carry on the Centrino name as Intel Core already has, but Conroe will simply be referred to as Core 2. The message is confusing with Apple's non-use of the Centrino brand - but let's see what their marketing people come up with when their use of the various options pans out.
This is a common mistake.
Centrino isn't a CPU. It's a package consisting of the CPU, chipset and wifi components.
Apple doesn't use all the components so can't market it as Centrino even if they were inclined to do so. I'm not sure it'd carry any marketing clout anyway since it's mostly a badge marketing exercise. Manufacturers get discounts for sticking those horrible badges on their laptops.
There's similar schemes for VIIV and vPRO for media and office desktops respectively.
In fact, another question... will Intel Core (Yonah) be discontinued, or be the budget option as Celeron is now? This might be what Apple need to differentiate Macbook from Macbook Pro, and Mac Pro from iMac/eMac?!?!
The Celeron M 4xx series is based on the Yonah already. I'd imagine Apple would have used that already if they wanted to. I'd also guess the Macbook Pro will use Merom as soon as the next CPU refresh and they up the Pro to 2.3Ghz although they may hold off for the next chipset for the MacBook to get better integrated graphics.
The iMac uses a laptop CPU - Yonah - with slow FSB and lower performance. The MacPro (or whatever it'll be called) won't. Already quite different even just at the technology level never mind the form factors. I do wonder though if they'll use Conroe instead of Merom in the next iMac. Conroe is likely to be cheaper as it's a desktop part.