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The Duramax has under gone a few changes. The heads a bit different, there have actually been two major revisions to the castings IIRC. The addition of EGR which was one of the casting revisions on the heads. But yes, basically the current LMM is the same as the LB7.
The fuel systems has had several revisions, both injectors and pump. The overall design hasn't change in the same way that Cummins and Navistar have done though. The 6.4 is shaping up to be a very good engine from what I have seen of the engine in the MaxxForce badged version, but only time will tell.
The major thing I don't like is the additional emissions equipment. Have a lot of experience with diesel emissions systems, I don't want to own them personally. The muffler assemblies are quite expensive once they are out of warranty, and they will require more maintenance. From a performance standpoint the emissions inspections will get more thorough and hot rodding them will be increasing expensive and more difficult. Just my .02 worth though.