OK, That's true, but I seriously doubt whether Apple would want to keep us waiting for new MBPs much longer. I should think that both the iMac and MBP will be updated at WWDC.
Think again, Apple has never to my knowledge announced a consumer targeted computer (iMac, Mac Mini, MB, and their predicessors) at the WWDC. Apple will not announce an update to the iMac at the WWDC. The iMac maybe updated before or after the WWDC, but there is not connection between the two.
Apple has in the past used the WWDC to announce new pro hardware, but that doesn't mean a MBP will necessarily be updated at the time of the WWDC, it could come as soon as May.