On June 10 Apple kicks off its 4-day Worldwide Developers Conference in San Francisco, better known as WWDC. Last year’s conference saw a new MacBook Pro unveiled complete with a Retina Display and a resolution of 2560 x 1600. And this year the focus is yet again expected to be on the MacBook Pro and Apple’s thinner and lighter laptop the MacBook Air.Of course, Apple isn’t saying anything until WWDC begins, but that doesn’t stop analysts taking educated guesses as to what we can expect to see. This year, Intel’s Haswell processors are expected to allow Apple to make a few changes to their laptop line up. More specifically, it’s expected the Pro models will get even thinner.Currently, both the MacBook Pro and Air use Intel’s Ivy Bridge processors. Haswell improves upon Ivy Bridge in a number of ways, but most significantly for Apple, reduces power consumption and adds an advanced power saving system. That means less heat production and the same battery life from a smaller battery.If Apple embraces Haswell early, which it is expected to do, we could see a new MacBook Pro unveiled that’s even thinner than the current 0.95-inch 2012 version. Alternatively, we could see the thickness stay the same, but the battery life extended beyond the existing 7 hours Apple quotes.KGI securities analyst Ming-Chi Kuo believes Apple will opt for a thinner MacBook Pro. The FaceTime HD camera is also expected to improve from the existing 720p part to a 1080p-capable solution. As for the MacBook Air, alongside a similar move to Haswell processors, it’s also expected that dual built-in microphones will be added for improved voice quality.Such improvements are just speculation, but I’m sure many would argue the MacBook Pro is already thin enough and improved battery life is more desirable. Apple shipping a new Pro that looks the same as the existing model, but achieves 10 hours of battery life surely wouldn’t lose it any fans. A similar battery life improvement for the MacBook Air would also no doubt be welcomed.