For handheld shooting, I'd envisage shooting with the Flash unit bolted on the camera, with maybe one or two rails on back for the batteries (add on the holder) , grip handle on top. Put a lightweight mattebox on the lens and you're ready. For the cherry on the top, you can attach the EVF and/or LCD to the bridge on the top of the camera (still to be confirmed as part of the camera accessories). Since the bridge was Jim's idea ? and was rendered, it shouldn't be too hard to convince 'em :)
All of these can be purchased individually.
Since the battery and drive were moved off the camera you've got an exponential increase in capacity (320GB is amazing). A holder, grip, arm, and a couple rails to purchase are a very easy purchase, considering...modularity will lead to combinations we've not even considered yet