According to 9to5Mac, Apple is constraining the supply of all current MacBook models, in anticipation of a refresh of the line of the product. They also claim that the part numbers for new MacBook Pros have shown up in Apple’s inventory. The model numbers are K90IA for the new 13 inch model, K91A for the 15 inch and K92A for the 17 inch model.
Last month, we had rumors of a refresh to the MacBook, and now that we have these parts showing up in Apple’s inventory, it seems that a minor update to the products is imminent. We don’t expect a major update until Intel’s Ivy Bridge line of processors is released.