When I ordered the 700 I also ordered the MB10 and the BL-3 door for the -el4's. I also ordered the Markins MB10 plate from the Pro Shop so that I can actually use the camera on my Arca system until L brackets are available.
I have a couple of questions. Do you have to have an ENL3 in the camera for it to work with the MB10? Does the MB-10 stick in to the existing battery slot like the D100's battery pack does?
Luckily I have several el4's and a charger for my D2X.