Forum OpenACS Q&A: Response to Can we have a new web/db forum?

David, ACS 5.0 (really, 4.5) is no big secret. You can find the source here. I believe it's been there about a month. And you're right, it looks very interesting. As far as the open source/closed source stuff: according to Tracy Adams, they have about 2 developers out of 30 working on the closed source modules. The rest are going full force on the open source ACS 4.5 (aka ACS 5), which should be released in July.

Disclaimer: My information is about a month old and is what I remember from the aD Austin Developer's Event. It's quite possibly wrong or outdated.