Apple allegedly offers QuickTime 7.6 beta version and soon it will offer Mac OS X 10.4 Tiger, 10.5 Leopard, and Windows users 5.1 audio, as well as several optimizations. Apple has requested their developers to stress the current build with multi channel audio and playback audio in each channel but the GPU acceleration is not expected to come with this update.

Even more Apple indicated developers to test MPEG-1 process including encoding and playback thoroughly.
Before unveiling the QuickTime X, this build is one of the last few updates to the new platform. This new platform can be reworked from the ground up and will be designed for latest and future AV formats and to give refined efficiency.

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