As others have stated, the MBA is not going to get updated, and one of the sizes, probably the 11", will get axed.
You can't have the Air moniker unless it is the thinnest and lightest in the line-up. I can tell you right now, if you think the rMB is too thin and light, you would probably not like anything redesigned with the MBA moniker. The name Macbook for the rMB made a statement about the MBA's future.
The iPad Pro will probably be a real "personal/private use" laptop killer I think. I already have replaced the need for a personal laptop with iPads. Don't think it will make a dent in even the small business market though unless its version of iOS 9 really opens it up.