Anyone looking to purchase a new 15-inch MacBook Pro over the last few weeks may have noticed it’s taking an increasingly long time for their order to ship. That may be due to an apparent decision on Apple’s part to begin whittling down its MacBook stock ahead of its June 8-12 Worldwide Developers Conference (WWDC). Apple has not commented on the matter, but this could indicate a revision of the 15-inch MacBook Pro or a new flagship MacBook line entirely.

A quick visit to Apple’s online store indicates the 15-inch MacBook Pros will not ship for three to five days, or even two to three weeks, depending on the model chosen. Power seller MacMall only has the 15-inch MacBook Pro with Retina Display in stock. Could this signal a new MacBook Pro will be announced at WWDC?

WWDC has historically been a place for big announcements for Apple. Whether it’s new product lines, reinventions of existing products, or iterations on software, Apple tends to share a lot during the conference. Let’s take a look back at some of the things that have been announced at WWDC over the years.

2005

During the keynote address, Apple CEO Steve Jobs announced its new partnership with Intel and a switch to using Intel processors in all its computers. The move also meant Apple was moving away from using IBM and Freescales PowerPC chips. The move was criticized initially, but over time, Apple’s improved product line made the reasoning clear.

2006

Jobs announced the Power Mac was on its way out and was being replaced by the Mac Pro. The Mac Pro was touted as being twice as fast as its predecessor, thanks to its Xeon processor from Intel. The power-user machine also came with room to easily install up to four 500 GB hard drives.

2007

This was a light year by comparison for Apple at WWDC, as it chose to spend most of its time showing off Mac OS X Leopard. Apple also pushed its Safari web browser out to PCs.

2008

As the iPhone continued to grow in popularity (which was first released in January of 2007), Apple began to shift more of its WWDC focus to it as well. In 2008, Apple unveiled the iOS App Store, iOS 2, the iPhone 3G, as well as a preview of Mac OS X Snow Leopard.

2009

2009 saw the introduction of the 13-inch MacBook Pro, and the 15-inch and 17-inch MacBook Pros were refreshed. Additionally, the iPhone 3Gs was unveiled, which began the every-other-year cadence of Apple refreshing its iPhone line.

2010

This year marked the first time Apple essentially ignored Mac OS, MacBook, and pretty much anything not named iPhone or iOS. The iPhone 4 was announced, and FaceTime and the iMovie app were revealed.

2011

Apple unveiled Mac OS X Lion, iOS 5, and iCloud, which would come to play a large role on all Apple devices, including iPhones, MacBooks, and even iPads.

2012

Finally, some big news for MacBook as Apple announced new versions of the MacBook Air and MacBook Pro. Apple also revealed the MacBook Pro with Retina Display, which set the standard for visual fidelity on laptop screens. Apple also showed off Mac OS X Mountain Lion and iOS6.

2013

Apple again spent some time on MacBooks, unveiling new, faster MacBook Airs. Also announced was a new Mac Pro, iTunes Radio, and iWork for iCloud.

2014

This was a light year for Apple at WWDC, announcing iOS8 and Mac OS X 10.10 Yosemite.

Apple has been pretty successful at preventing leaks prior to its conferences in the past, and this year is no different. While rumors swirl about a new version or re-imagination of the Apple TV, nothing has been confirmed. Other speculations include a paid streaming music service and even a streaming television service.

Other than the dwindling supply of 15-inch MacBook Pros, no concrete evidence exists detailing a new MacBook Pro line.

WWDC begins June 8 in San Francisco.

[Image via Digital Trends]