I agree with Peter. DOF adapters came and went. The height of their arrival was because HDSLR cameras hadn't been released yet. When those came, people started shooting on those for their narrow DOF, rather than the bulky DOF adapters. I actually still have my Letus Extreme, probably should have sold it, but it's here.
I still don't think DOF adapters will be needed to get the narrow DOF you want from the Cinema Camera. Sure it wont be as easy or razor-thin as a 5D with a 50mm f/1.2L, but you'll still be able to get pleasing DOF with it. As the camera is released and people really start using it, I think they'll see they'll get the DOF they want, or close to it. Again, maybe not as fast or razor-thin as a 5D, but then again, that's probably a good thing. ;-)
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