You know, for what it's worth, I figured I'd post this for thos of us who can't wait any longer.
There is a free alternative that I have been testing and works like a champ with one issue that I ran into. Check out "YetAnotherForum" - http://yetanotherforum.net - this is an ASP.NET forum software and it's free. There is a DNN PA Connector that is also available. I have setup and tested, and am currently running the software on my sites with no problems that I can think of. The installation was simple and worked with no issues. The software runs well, is able to use DNNs internal userbase, and again seems to run quite well. The ONLY show stopper I've run into is that the software uses it's own URL rewriter for SEO links, but when running under DNN the rewriting is not available. There is a conflict with the two rewriters which causes the YAF one to not work. So if you're not needing SEO links that bad, you should check the forum code out. We're running it, and to be honest, it was worth every minute of time to setup and get running.
Sorry to throw a bust in the DNN Forum progress, but like many have said - with the major features that didn't work prior to this still waited on release, combined with the fact there is no light at the end of the tunnel for a working version, I felt best to let others know of the solution I found. Who knows, maybe with a little more polish on the DNN PA Connector they are working on, there is possibility of a full-featured system available for free.
Good luck with the core development. In the meantime, we'll stick with YAF on our end --