Apple might be building 400,000 new MacBook Airs this month. This information comes from a reliable source and 55% will be the 11″ with 45% being the 13.3″ made. The 11″ is proving to be selling more. The new MacBook Airs will just be updated to Intel’s 32-nanometer Sandy Bridge processors, making them faster. Apple will likely just slip this in without us noticing.