The previous capabilities of Quicktime, Airport Utility, Disk Utility, and Pages did not come back. The "new" Quicktime was introduced 8 years ago.

The pattern we've seen is Apple decides to re-write a utility because reasons. The new version comes out as part of a major OS release. Then nothing further happens.

The exceptions are the major apps like iTunes, Safari, iMovie, and iPhoto. Also the "discoveryd" re-write is extremely noteworthy in that it was fully withdrawn and replaced by its predecessor.