The new Mizuno MP-68 Irons Blade moves away from the cut muscle design that the MP-67 had and resembles the MP-37 with the muscle back developing from the toe area. The muscle back lines and edges however are smoother on the MP-68 than the MP-37 and some in Japan have said it reminds them of the classic MP-14 with its curved muscle back and sharp toe.

Mizuno has also followed suit with its 2009 design guidlines by placing the running bird logo on the sole and the model MP-68 with new MP logo in the toe corner.

For the last several years pre release Mizuno head only sets have popped up far before the official release date. They look perfect to the untrained eye but when put on the scale the head weights are off and the hosel size often appears to be over or undersized. 

This has been the unfortunate case for many of Mizuno's MP models in recent years but its a consistent pattern. Right now there are sets on ebay and in certain forums of possible fakes. Im sure if you contact Mizuno they will say these are not Mizuno authorized products.