Hi Marcus and Matthew,
Bridge CS6 should thumbnail the side by side pair for .jps and .pns formats, and offer an Open With Ps CS6 option (you may need to make sure the OS has Ps set as the opener for those formats. The .mpo format thumbnails only the left side image.)
Camera Raw will not open these formats, but will open JPG. You can rename the file extension for .jps to .jpg and then open the file into Camera Raw. For the .mpo and .pns formats the workflow to get them to .tif adds a little extra work, but also affords Camera Raw editing. Once you've made CR edits and open the file into Ps, you can 'Save As' to JPEG Stereo Format again (remember that this format is lossy so you may also want to also keep a .psd file for editing).
With Ps CS6, you can do general image and color manipulation on .jps, .pns, and, .mpo files; it is localized corrections that are still not handled well for stereo pairs. Something that's throwing you off is the creation of a 3D layer for viewing the stereo pairs on open. What you need to do is either double click the 'Textures' file in the Layers panel, or look in the Properties panel for a button named 'Edit Source'. These are the original left-right pairs in the file.
I haven't found a video tutorial walking thru a workflow yet, but imagine they'll be coming out as people explore the new feature set.
regards,
steve
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