Quicktime 6 Public Preview

Saw this over on Slashdot.

Quicktime 6 Public Preview is now available. New features in v6 include :-

MPEG-4 File Format (.mp4): Since the QuickTime file format is at the foundation of MPEG-4, QuickTime 6 supports .mp4 files as first-class citizens. So with QuickTime 6, you can author professional-quality, ISO-compliant MPEG-4 audio and video files that can be played back not only by QuickTime 6, but by any other MPEG-4-compliant player.
MPEG-4 Video: The high-performance MPEG-4 video codec included in QuickTime 6 provides the highest quality results across a wide spectrum of data rates — from narrowband to broadband and beyond.
AAC Audio: AAC is the new standard in professional audio. It provides more efficient compression than older formats such as MP3, yet delivers quality rivaling that of uncompressed CD audio.
Instant-On: Instant-On means instant gratification for broadband users. Instant-On gives you an immediate and smooth playback experience — and instant access as you jump or "scrub" through a movie using the time slider.
Skip Protection: Apple's patent-pending technology for preventing interruptions or skips in streaming media just got better.
Updated User Interface
QuickTime 6 also includes a new DVC Pro PAL video codec, support for Macromedia Flash 5, a new JPEG 2000 still image codec for Mac OS X, enhanced AppleScript support, and a host of new developer application programming interfaces (APIs).
Q. How long can I use QuickTime 6 Public Preview?
A. This software will expire in October, 2002
Q. Will my QuickTime 5 Pro key work in this Public Preview?
A. YES. QuickTime 6 Public Preview will automatically recognize your QuickTime 5 Pro key during installation.
Q. Will my QuickTime 5 Pro key work in the final release of QuickTime 6?
A. NO, Because QuickTime 6 will include royalty-bearing technologies, a new QuickTime Pro key will be required to unlock pro functionality in the final release.