Alright as soon as anyone has the Dawnguard Demo please let us know

Any beta testers have, most likely, signed an NDA. They'd be violating it if they were to discuss/leak info.

I'm sure there's plenty of topics in the General Discussion forum, doesn't need to be discussed in the "Issues" forum.

Stating you "have" the beta shouldn't break anything. Divulging details on the content would indeed.