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Richard, yes the V6 maximum RPM is 15k but as I said they will most probably use a redline of 12k.
Some time ago there were rumours that RBR were using a start only KERS.
Reports are RBR has been packaging their KERS batteries beside and inside the gearbox so as to use a shorter fuel tank, this brings the engine forward and so allowing the use of a longer and slimmer gearbox which is beneficial to aero.