Its tracked. It's the percussion track plus winds I think from when Obi-Wan chases Grevious...
It's all tracked in the deleted scenes... although that doesn't mean some of it isn't unreleased, some of it is unreleased or unused music... but all of it is tracked. Williams only scores scenes that are in the edit he gets... and most of thsoe scenes were cut before that... and rebuilt later for the DVD