The weird thing is the TSA document that illustrates these changes shows what looks like a standard SAK (something like a hiker ... with the phillips instead of the corkscrew) as an example of an allowed knife. I thought standard SAKs have blade lengths just over 6 cm?

Here's the document: Changes to Prohibited Items List (PIL) - March 2013

The complete list of criteria for allowable knives is:
  • The blade is no longer than 2.36 inches or 6 centimeters in length
  • The blade width is no more than ½ inch at its widest point
  • The knife does not have a locking or fixed blade
  • The knife does not have a molded grip
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Victory awaits him who has everything in order — luck, people call it. Defeat is certain for him who has neglected to take the necessary precautions in time; this is called bad luck. Roald Amundsen