From Racecar Engineering:
The incomplete Marussia 2015 Formula 1 car design has been revealed after the teams financial collapse. Shown here as an incomplete wind tunnel model the car which would have been called the Manor MNR1-Ferrari carries over much of the 2014 design.
New rules being introduced for the 2015 season mean that the nose structures of the cars have to be reworked and the Manor-Marussia solution is clear to see on this scale model. Compared to the 2014 MR03 the front of the chassis is lower and as a result the front suspension pushrod mountings have created blisters on the upper surface of the tub. A new front wing endplate design is also evident.
At the rear of the car the 2014 concept has largely carried over with the much copied Y-Lon rear wing support. The wing itself is updated compared to the last version seen on a Marussia MR03 (in Sochi), the endplate now features Ferrari style strakes on its outer edge and twin vents on the leading edge instead of the single vent seen at Sochi.
It is conceivable that Marussia had intended to modify its MR03 chassis to meet the new for 2015 rules in an attempt to reduce costs, which highlights the amount of similarity seen with the new design, but also its likely that the Marussia engineers were utilising the same model used for the 2014 design for the 2015 work.