Interesting read and I liked the info on the front wheel drive choice, so very interesting stuff in there.
FWD yes, but thats not the whole truth.... The engine will drive the front wheels - 550hp and there is an electric motor(s) (which harvest from the front KERS) to drive the rear wheels - 700hp, which all adds up to a tidy 1250hp.
http://www.topgear.com/uk/car-news/nissan-gt-r-le-mans-car-2015-02-02
Considering that the GTRs are RWD with an active 4WD (a good system, but keep in mind that there are 2 drive shafts, 1 to the back and 1 to transfer power to the front), the LMP1 system fits in perfectly with the "guessing" for the R36 GTR, which is over 700hp hybrid (engine driving one set of wheels and electric motors driving the other set) - this would then save a LOT of weight on the GTR (albeit they would add it all back with the electric motors and batteries).
Also in the above article:-
EDIT - Forgot to mention that I saw this car, it was "unveiled" at the Nurburgring 24h Race to guests of Nissan, got to have a good close-up look around