AT MWSF, probably not. They won't waste time in a keynote to announce a simple speed bump.
Around MWSF, probably. Sometime between January-February we're going to see the MBP get a slight speed bump to Penryn. That's going to be it though, no major changes.
If there's going to be a major change, it's going to be in the Summer when Montevina comes out, and here's why:
Penryn is pin-compatible with the current Santa Rosa logic boards, so it would just be changing the processor being used. If Apple were to redesign the case or make other radical changes, they'd have to design a new logic board. Then, 6 months down the line when Montevina comes out, they have to make another new logic board. That's just going to be a waste of resources and cost them more money.
So they'll update in January (or Feb) to 2.5 and 2.6 GHz Penryn. There won't be any redesign.
Come the Summer/Q3 when Montevina comes out, you'll have a bigger update. There could definitely be a case redesign since they'll be changing the inner components anyways.
Montevina is going to bring a faster FSB, a faster ram, WiMAX. You'll probably see a GFX update. The processors will be 2.53GHz and 2.8GHz.