MMC are planning for May but anticipate some supply chain issues (particuallry for anything with a chip in it) so June is probably more likely.
I don't think they are being deliberately coy about the sound as they say they only have 3 engine run modules which are being swapped between the prototypes. These are currently prioritised for the validation cars to build test mileage. The earlier engineering prototypes used for the launch are without these modules so at the moment can't be run.
All those I spoke to at the launch who had heard the car said it had a good rasp and sounded similar to a straight six which can't be bad. I'm sure we will hear it for real as soon as they can.
