[Philip Lelyveld comment: Although this is not a 3D-specific story, it is useful info for the 3D community. Jerry Pierce narrates this excellent overview of what the IMF is and is not.]
See the video here on the Interoperable Mastering Format Forum (IMFF) website, but you will need to be a SMPTE member to delve into the website: http://www.imfforum.com/IMF_Forum/Home.html