Hello,
We have been postponing forums several times as we had some other high-demand features requested by customers. (We prioritize all pending requests every few weeks based on client requests - see http://www.wildapricot.com/ongoing-innovation-release-history.aspx )
It has finally made its way into development - we finished visual design a week ago and started development this Monday. It will be released in 3 weeks. It should be quite robust, though our general approach is to keep first version as simple as possible and address core needs - and then enhance based on user feedback.
FYI, our blog module (one of the things which pushed down the forums) is available since June and allows posts (i.e. not only replies) by members so can be used as a forum of sorts.
Dmitry Buterin, Chief Apricot