Bikes and frames will be in shops early September and there is a Demo 8 II bike, Demo 8 I bike and a frame option that will be available.
Curtis Keene On the 2011 Specialized Demo 8
The frame now uses a “shock extension” or “bearing adapter”. The shock is totally stock, but we slide on a Y shaped piece. This allows us to put the shock pivot in a location that was formerly not possible – right next to the tire.
The 2010 and 2011 ( red 2010, black 2011 ) :

The geometry is all the same, but they added one more size: Extra small ! The rear axle is now 150 mm, from the 135 mm of the 2010 frame. The bottom bracket is 83 mm, using the new Press Fit Standard (BB30) . The frame will also be more progressive in its spring rate curve than the previous model.
Avid Code 2011 brakes in the last pic !