The A400M will not be fitted with co-axial contraprops. It will have an advanced propeller system with a 17.5 ft diameter 8-bladed propeller with composite blades, control of which will be integrated into the EuroProp International TP400-D6 high-speed turboprops' FADEC to maintain the engine and propeller system at a constant, optimum efficiency speed. All propellers will rotate in the same direction.
Since the aeroplane will fly using Airbus' FBW magic, a single engine failure will probably be barely noticeable to the crew - no shaking legs on the rudder bar or other asymmetric control problems, just point it in the required direction with the side-stick and let the FBW and FADEC do the hard stuff.......