If you read Think Secret here, 10.3.9 should be able to run Quicktime 7:
http://www.thinksecret.com/news/0504briefly.html
What this suggests is that it would be entirely possible for Apple to make yet another Panther update, make it ready for all their NAB announcement applications, and not need to release Tiger by NAB. Remember, it is Think Secret which says that Tiger to be released simultaneously with 10.3.9. However, if Apple finds more bugs, having a version of 10.3 that will run Quicktime 7 does give it the option of holding off on Tiger, and still being ready for NAB, since most of the NAB application updates only need Quicktime 7. Unless there is something else in Tiger that precludes Apple from updating its video applications for NAB, I think Apple has a backup plan for releasing Tiger later rather than sooner.
http://www.thinksecret.com/news/0504briefly.html
What this suggests is that it would be entirely possible for Apple to make yet another Panther update, make it ready for all their NAB announcement applications, and not need to release Tiger by NAB. Remember, it is Think Secret which says that Tiger to be released simultaneously with 10.3.9. However, if Apple finds more bugs, having a version of 10.3 that will run Quicktime 7 does give it the option of holding off on Tiger, and still being ready for NAB, since most of the NAB application updates only need Quicktime 7. Unless there is something else in Tiger that precludes Apple from updating its video applications for NAB, I think Apple has a backup plan for releasing Tiger later rather than sooner.