Updated encoder in iTunes 7?

Does anybody know if iTunes 7 uses a different encoder for AAC files? an updated, improved one?
Thanks.

The encoding itself is done by QuickTime, not iTunes. So if the version of QuickTime is the same, so is the encoding.
Gapless playback does not require an encoding change, but a change to:
1. The ID3 tags
2. Interpretation of the tags
For reference, MP3 does not officially support gapless playback - there will always be some artifact between tracks. AAC does support gapless, but until now Apple has not utilized this feature.

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