Several reports around the blogosphere indicate that Apple is readying their Core 2 Duo notebook and that it will be released any day now. German site MacGadget.de says that it could get announced at the beginning of the week (which ends todays) and MacRumors is claiming today is the day, partially because Apple likes to announce new hardware on Tuesday. 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.