According to an Applesana message board poster, there is a report that the newest build of OS X 10.6.2 10C531 contains references to new MacBook Pros. The current version of MacBook Pros are at 5_5, the screen shot shows MacBook Pros 6_1 and 6_2. 

Could a new MacBook Pro be coming with the introduction of the 10.6.2 update?

There is also speculation that Apple Store Geniuses are being trained on the new Quad-Core processors, which could be in MacBook Pros. Delivery could be timed with the new intel Core i5 and i7 iMacs in November.