I just wonder if they are ever going to reconcile the iPad Air (which is premium over the least expensive iPad) and MacBook Air (which is the least expensive MacBook...but not always the lightest). I'm not quite sure what "air" means anymore.
A 15" MacBook certainly isn't going to be light (so it really isn't an "Air")...but if they just call it a MacBook, then they've really confused the term on the iPad side.
I understand that not everything needs to fit into Steve Jobs' simplistic 2 x 2 grid (after all, they sell an order of magnitude more devices...maybe 2 orders of magnitude if you include the iPhone), but it might be nice if the names meant something.
After all, they dropped the PowerBook name when they dropped the PowerPC chip. "MacBook" took a little while to get used to, but at least it made sense.
iPad Air and MacBook Air remain the lightest product in their respective form factors. There's no confusion, IMO.
When Apple launches their 15.5-inch MacBook, they may borrow the Plus name from the iPhone family.