Let's see what kind of racing this produces. It might be great, or not.
If Toyota goes with the (rumored) 5-liter V8, Porsche with ~2-liter I4, HPD with a 2.2 V6, and Audi with another V6 diesel I'd call that variety.
Throw in Dome with maybe a V10 Judd ....
On top of that, two or three different hybrid systems (assuming we see batteries, flybrid, and super-capacitors) all possibly operating at different output levels ... pretty fair amount of freedom for designers.
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