Preview at WWDC likely in June, followed by September launch.
Ultra-Thin 15" Mac Notebook Getting Closer to Production
according to asian source, Apple seems already to have finished to develop MacBook Air 15" LCD test component to add its line-up and to go product develpment of it.Macotakara is calling the new notebook a 15" MacBook Air, but we aren't entirely sure that would be the name.
Current MacBook Air
Back in April, we had heard reliable confirmation that the 2012 revision of the MacBook Pro would carry a new case design. iLounge had described it as a "milestone" release. Later, in July, we heard that Apple was already finishing up work on this ultra-thin 15" Mac Notebook.
At this point, it seems clear that Apple's next MacBook Pro revision will carry this new design, which many believe will take cues from the current MacBook Air designs. What's not clear is how Apple will integrate the new models with the current MacBook Air models. The MacBook Air and MacBook Pro lines seem destined to converge over time. In fact, Intel believes that Air-like "ultrabook" designs could make up to 40% of the consumer laptop market by the end of 2012. Apple just updated their MacBook Pro line with faster processors, which places their next revision sometime in the first half of 2012.