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Other than the addition of Intel new Core 2 Duo processor, Apple's next raft of notebooks are likely to receive larger hard drives (160GB), Dual Layer SuperDrives and even FireWire 800 in all models, according to some reports.
It looks certain that Apple will upgrade both the 15 and the 17-inch MacBook Pro to Core 2 Duo, but the jury is still out on the consumer MacBook. Everything I've heard indicates that the MacBook will stay with the Core Duo processor while it's big brother (the MBP) gets the new silicon. As I've stated before, I think that Apple will use the new C2D chip to differentiate the Pro line of notebooks.
Probably the strongest evidence that new iron is arriving today is the "be back soon" sign that's hanging in the window of Apple's online store. Stay tuned.