Back in February, iLounge reported:
The MacBook Pro update expected tomorrow is reportedly an incremental update to the aluminum unibody version currently available. Next year is the year when Apple will introduce an all new design for the MacBook Pro product family, which is already under development at Quanta in Taiwan. It's being described as a big, "milestone" release for the Pro family
MacRumors has now received 'reliable confirmation' of this report.
Unfortunately, we have no specifics on what the next MacBook Pro might look like, though many have previously speculated that Apple will take cues from the MacBook Air line.