Looking to purchase a new MacBook Pro this weekend? You may want to hold onto your cash for a little while, because Apple looks set to refresh its popular notebook family imminently.

According to a report from 9to5Mac, supply levels of Apple’s existing MacBook Pro lineup are “heavily constrained with all models appearing to be nearly out of stock.” When Apple allows supplies of popular products to run low like this, it’s a solid indication that a product refresh is on its way.

That’s backed up by an update to Apple’s internal inventory which says new 13-inch, 15-inch and 17-inch MacBook Pros are on the way. According to the report, the Cupertino company will continue to offer two models of the 13- and 15-inch devices, and one 17-inch model — as it does now.

Don’t expect this to be a major refresh, however. It is reported to be a minor update to introduce “marginally” faster processors and the Bluetooth 4.0 technology that Apple recently introduced to its MacBook Air, and the iPhone 4S, which launched in a number of countries today.

The internal code names for the new notebooks are said to be K90IA for the 13-inch model, K91A for the 15-inch model, and K92A for the 17-inch model. It’s the ‘A’ at the end of those code names that signifies this is a minor update, according to 9to5Mac. A major update traditionally warrants completely different code names altogether.

Are you excited about an update to Apple’s MacBook Pro lineup?

[via 9to5Mac]