Apple will presumably have a support document on this soon enough, but in the meantime, the newly-released QuickTime 7.4 removes many of the older audio and video codecs from export dialogs by default.
If you have QuickTime Player Pro (or presumably any other media app that uses QuickTime, such as iMovie or Final Cut), open a movie, go to the export dialog, and bring up “Movie to QuickTime Movie”. Drill to the advanced options and check out your video and audio settings. Whereas the video codecs for output used to look like this:
They now look like this:
Audio has been similarly pared down, from:
to:
This isn’t cause for alarm. It’s probably a good decision. It’s hard enough for typical end-users to know what codecs to use (in some cases, it’s better to make the choice for them by means of a good/better/best set of canned export settings), and many of these are unquestionably obsolete, such as Cinepak. It is interesting, however, to see the Sorenson Video 3 that was such a lynchpin of QuickTime for so long, relegated to footnote status.
Plus, all the codecs are still there, and can be shown by way of an option in the “advanced” tab of the QuickTime preferences:
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