Thanks, but do you know if it was natively filmed in say Dolby 3d and remastered for Imax, or is the "native" experience going to be imax?
It was filmed with a brand-new 3D camera, if that is what you are asking.
It wasn't filmed with, well, film, but rather digital. So in essence, it is digital 3D, but not using the current cameras or equipment, IIRC.
The big question is resolution. IMAX is notable simply because it has a larger film area, the negatives are huge compared to 35mm film stock. Thus, in a digital world, it offers greater resolution and, in the film world, an overall better image due to increased film detail and whatnot (my attempt to simplify this, no need to explain why the 70mm film is worlds better than 35mm film). Film doesn't have a resolution, per se, so I won't go into that topic either.
Suffice it to say, I expect the native resolution of the cameras used for Avatar will awesomely translate to all viewing experiences.