OpenEXR v2. beta 1

http://www.openexr.com

"June 18, 2012 - We’re pleased to announce the first public Beta release of OpenEXR v2.
Development of OpenEXR v2 has been undertaken in a collaborative environment (cf. previous github announcement) comprised of Industrial Light & Magic, Weta Digital as well as a number of other contributors.
Some of the new features included in the Beta.1 release of OpenEXR v2 are:

  • Deep Data. Pixels can now store a variable length list of samples. The main rationale behind deep-images is to have multiple values at different depths for each pixel. OpenEXR v2 supports both hard surface and volumetric representation requirements for deep compositing workflows.
  • Multi-part image files. With OpenEXR v2, files can now contain a number of separate, but related, images in one file. Access to any part is independent of the others; in particular, no access of data need take place for unrequested parts.
    In addition, OpenEXR v2 also contains platform independent mechanisms for handling co-existing library version conflicts in the same process space. (Currently implemented in IlmImf)
    Finally, a reminder that this is a Beta release and potentially incompatible changes may be introduced in future releases prior to the v2.0.0 production version."

code :https://github.com/openexr/openexr/tree/v2_beta.1

very good news, I hope Blender could include this as soon as it is available the stable version