Another difference, not neccessarily design or performance related, is that the 2012 Jaws will not have a 54*. From the 2012 Callaway catalog I saw the Jaws will go from 52 to 56. The new forged wedges do have a 54* as I recall
I bought the Jaws 54* this year once I saw that they were not offering it for next year.
No 54*??? That is a pretty popular loft is it not?