MacBook Air :: Completely No CPU Throttling At All?

There have been many brief posts mentioning that unlike previous MBAs, the new MBAs do not slow down the CPU when heat goes beyond a certain point. Does this mean there is completely no CPU throttling at all? Or that it still throttles, but at a higher heat level? If there is completely no CPU throttling, then logically it should fall back to another common method of handling overheating which is to automatically turn off the machine (not a very elegant method, but at least it's something). Do the new MBAs do this? If not, how do they handle overheating?