If rumors are to be believed, Apple will be releasing its new range of MacBook Airs with the upcoming Lion OS X on July 14.

Previously, a July 19 release date was rumored, but now an early release is more likely. 9to5Mac reported that a new update to Pro Line will be released along with the MacBook Air refresh and Mac OS X 10.7.

Apple’s manufacturing partner, Quanta Computer, was previously readying a shipment in June of 380,000 upgraded MacBook Air models. Now there is a possibility that four new MacBook Airs will debut on Thursday. Two 11-inch and two 13-inch models are expected to be released.

The MacBook Air is expected to come with the new Sandy Bridge processor, and will also include Apple’s Thunderbolt I/O technology. The Air is also rumored to adopt the mSATA connector that will allow a flash drive to be inserted in the motherboard, which will take very little space. The Air’s memory is called “Toggle DDR 2.0,” which is built over a 19nm process. It can reach speeds of 400Mbps while using less power than previous drives. The next-generation MacBook Airs are expected to be much faster and more energy efficient.

The MacBook Pro, however, is expected to get a redesign that will be narrower and can be mounted on a rack. The Thunderbolt I/O technology is also expected in the Pro. An enhanced 16-core model is also being rumored.

Lion OS X will be available at the Mac App Store for $29.99, 9to5Mac reported.