I think it's a little unreasonable to to demand that symantec provide a definitive ship date for an OS that isn't officially shipping until October 22nd.
Regardless of the RTM date of Win 7, those who have worked in large enterprises know that we can hardly expect compatibility of any of our software on the official release date of a new OS. My experience shows that it usually takes a quarter or two to get all the apps certified. (and thats from large firms).
For those who are working on large deployments of win7 and SEP, I figure you are large enough to have a TAM assigned. They could probably provide you the beta of the RU5 code so you could get moving.