It's still an old forum-like idea. I built an almost feature complete reddit clone (with some HN ideas along the way) in Laravel over the last month or so. I did it so that I can extend it into direction I need it down the road. We're launching in a week or so and my hope is that we will open source it for others to use as well.
To be perfectly honest, I think it's a problem for the PHP forum space in general but it's one I don't have time to try solving on my own (not admitting i'd succeed.)
[0] http://fluxbb.org/
EDIT: Its alpha 2.0 is built on Laravel and is a complete rebuild.