I'm beginning to think we are going to see a re-shuffled linup completely at this point.
MacBook (s) to use the 6.5w parts (Core M series)
the MacBook Air will be discontinued
MacBook Pro will use the 15w dual core ULVs
All the rumours keep pointing to a thinner, lighter, smaller "pro". I cannot see Apple keep using the quad core 28w parts and still being able to keep it cool and light, while shrinking the cooling to fit in a smaller chassis. Lets be honest, the current MBPRO chassis isn't significantly larger than the MBA as is.
Apple has already stopped using the Quad core 28w parts on other products. They've opted for the 15w ULV parts for their 21" iMacs and Mac Mini on last refreshes. Why is it unreasonable to think they may continue with the same and hit the Macbook Pro with the same changes