We saw her first at the Wonder Festival a month ago and now shes up for pre-order. BRSB (Black Rock Shooter Beast) is up for pre-order bundled with Huke-sensei's illustration book BLK which retails for 6800 yen. Or you can get the illustration book on its own for 3200 yen.
More photos at Good Smile.
Folks looking to pre-order can do so at one of these trusted online figure retailers.