Maybe make it customizable. Record your own message at boot-up. Sample a favorite track, or famous person's quote. Hmmm. . . .That could be a pretty sweet boot up noise for the infotainment system. Seeing as how all sounds are artificial in EV's now would be a good time to implement it.
Note to Jaguar: Since you have put in the ability to have a fake engine noise, can you also put in the sound of a jaguar growl when I start the car?