We're definitely working on Snow Leopard compatibility, and any problems we're aware of will get worked on between now and when the OS ships.
I won't rule out the possibility that someone from the engineering team will provide more info, but if they don't, it's because pre-release versions of Apple software generally fall under the confidentiality clause of the ADC membership agreement.
(I didn't want you to think that we're ignoring your question; we may just not be able to answer it outside of the
Apple Developer Forums.)