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http://lists.w3.org/Archives/Public/www-style/2011Feb/0704.html
The issue in the subject, what happens if a value has changed midway through a transition, is now well-defined. But it's not clear to me that the email is actually about what its subject line says.
I believe the spec is now clear about the points in (1) and (2), although it doesn't necessarily point them out clearly as authoring advice. I think there are some feature requests in (3) and (4), but they should be deferred to level 2.