Apple has released updates for the suite of video production applications via Software Update and as stand-alone installers; the latter require that you sign in using your Apple ID and your Final Cut Studio 2 serial number. Most of the updates cover bug fixes and improve stability, but a few items are notable.  (an ) patches the underlying frameworks and shared components of Final Cut Studio 2 (the package also seems to be specific to those applications).
 (a ) adds support for importing  (Advanced Video Codec High Definition) footage, a video format introduced last year that is designed to be saved to random-access storage devices such as hard disks, solid-state memory, and MiniDVD discs (versus MiniDV tapes, the media of choice for many consumer camcorders as well as cameras that record to the high-definition HDV format). Although a few AVCHD camcorders are currently available, editing the footage has been limited under Windows and nonexistent on the Mac. Apple's release notes indicate a few caveats with AVCHD footage, namely that as it's imported, the video is transcoded into either Apple ProRes 422 or Apple Intermediate Codec; that could require up to 10 times the size of the native AVCHD file of available hard disk space. (The inclusion of AVCHD also potentially means the format could be supported in the next version of iMovie HD.)
93.3 MB download) adds the capability to export music in the 256 Kbps AAC format used by iTunes Plus, can now set poster frames, and applies other fixes.  (an ) improves stability, metadata support from Final Cut Pro, and single-display mode, as well as floating-point processing on Macs with Nvidia graphics cards. (a ) fixes a number of known issues with 32-bit float projects and rendering of intersecting 3D groups, and improves performance.  (a ) improves stability and performance and updates the Delay Designer surround effect plug-in.  (a
Lastly, unrelated to Final Cut Studio 2, Apple released (a 12 MB download), which provides unspecified fixes but notes improved readability of certain CD media. The installer puts an application called SuperDrive Update 2.1 into your Utilities folder that must be run separately, which is unusual. Note that the application starts the update process at launch, which is bad form; it should behave like most updaters, where the user initiates the process (for example, to make sure the drive isn't in use, I would imagine). The updater also requires a restart of the Mac to take effect.