Apple is in the works of creating and patenting a head-tracking system that would manipulate the screen based on head positioning...http://www.softwareadvice.com/articles/construction/apple-3d-the-ultimate-display-for-construction-plans-1121809/. This link, published by Houston Neal, shows an example of how Apple is trying to program the technology for use with BIM.
Though I still am trying to picture how this would play in takeoffs and estimating with interfacing programs such as Revit -> Autodesk Quantity Takeoff -> and Sage Timberline, I do see a great benefit for this type of system as an addition or in great competition to programs such as Navisworks, Synchro, and others.