It'd be the most obvious leak in history, but the 10C531 build of OS 10.6.2 references the "MacBook Pro 6.1 and the MacBook Pro 6.1b." All current MacBook Pros are strictly "5" status.
Of course, this appears to be confirmation of the obvious, that Apple will be updating their MacBook Pro line to include Core i5/i7 chips following the white MacBook's Pro-level spec bump last week. (Apple will need to adopt these new chipsets to stay competitive.) Now we just need an answer to the far more important question: When? [Foro Applesana via AppleInsider]