Comment - For all you non-geek types, the biggest design impact of 3DImax is that it makes "normal" movies almost impossible. Imax screens are something like 5 stories high. Close-ups of people talking just don't work when the participants are that big. This is one reason most Imax films don't generally do this (plus the camera sounds and is as loud as steam train engine)
But do this in 3D and that 5-story-tall head is just the right size. The large screen fills your field of vision and provides the kind of depth that you have to experience.
Of course, 3D also has big effect on how you layout and design the scenes.... but I'm just a technology geek :-)