As detailed at The Allspark, there appear to be three different versions of Crankcase with three different hands.

1. Snipped middle finger: the long middle finger of Crankcase appears to have been (roughly) cut off at the factory, either due to safety concerns or concerns over the fact the toy is constantly giving kids the middle finger.
2. Middle finger unchanged: There have been reports that versions with unchanged hands have been found. These are the same as pre-production toys.
3. Retooled hands: According to pictures on Japanese image board 2chan, the Japanese release has a retooled hand with a much smaller middle finger.

So, we should report which versions we've bought and what production numbers (and such) are on it (I think it's the number stamped into the packaging cardboard and the toy plastic somewhere).