Any idea why they have extended the "turtledeck" several meters front of the sail?. Looks weird. It doesent give you anymore space either as i guess this is outside the pressure hull. Cant see any hatches either (if it was for some special equipment, towed array, comms etc). Was expecting a design more streamlined than the Delta IV, but no. At least they have removed the dive planes from the sail.
Regarding the covered rear fin, could be a Pelamida towed array system like on the Bulava testbed (Dmitry Donskoy) and the Oscar/Delta class, but cant see the reason for covering it.
Here is a picture from Sevmash, looks better than earlier pictures, at least they have put on all the acoustic tiles.
http://www.sevmash.ru/?m=show&id=3335&lg=en