Board Thread:Support Requests - Getting Technical/@comment-24396332-20140315021252/@comment-16101931-20140315193642

That is a feature that can be enabled through Special:WikiFeatures (you need admin rights to activate/deactivate features). If you look Under "Labs", it's the second one down called "Forum". Click "enable" to activate it, and you'll have the new style forum.

Hope this helps!