Truly Truly shows how unpredictable Apple is.
Gotta admit that I never saw it coming. If anything, 12" for MacBook and larger for MacBook Pro. Maybe we'll see next year the 12, 14 & 16 MacBook Pro range? But then that silly Air 13" wouldn't fit in - mind you, if they redesign the MacBook Pro next year, the Air will look dated in comparison.
You really never know how Apple thinks and operates. All very bizarre.