There has been a lot going on over the last few days, and kind of left in the dust has been this week's pre-orders. They include The Great Waaagh!, which gives the special abilities of calling a Waaagh every turn, including the first.
Here is a leaked image from Dakka showing the detachment.
via Frozocrone on dakka
http://www.dakkadakka.com/dakkaforum/posts/list/420/680014.page;jsessionid=6A83273003D1198744FFEDD8FEAD1BDE#8469316