Well, by the time that the racing module comes out (2020 or 2021), electric cars will be very popular. And so, not all cars will have a sound. It will come out probably after the Tesla Roadster 2.0 starts production and maybe it'll be in the game - A car with no sound and ''more than a hypercar'' performance.
But surely, some electric cars (and maybe even hybrids and plug-in hybrids) will be in the game, like the Nissan Leaf, Tesla Model S, 3 and X or even the VW I.D. series.
What I am interested about is the car re-fueling interface. As we all know, some EVs have different plugs and cables than others and support different charging standards. That is an opportunity to make really realistic charging mechanics, like having to choose adapters or even carrying cables to plug them into an outlet and the car.