they're just going to reveal ios8 and os x nothing about the iphone 6 as i heard
A Retina Macbook Air is unlikely now that they updated it a month ago.
What about the Macbook Pro? It makes sense. The Macbook Air was refreshed, Apple has discounted prices for the macbook pro, and the 9 months release cycle is nearly over.
My final predictions are a Healthbook app, TextEdit app, and Preview app as well as an OS X with new icons (much more iOS-like) and a control center. Everything will also be generally more flat.