I don't think that's a thing. This says "CarPlay Ultra joins CarPlay" - not that it will update or replace it. So if you've got CarPlay in your Toyota, you will continue to have CarPlay in your Toyota. If you want CarPlay Ultra, you will have to replace the whole car.
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I don't understand how they plan to update my 4-year-old Toyota.
I don't think that's a thing. This says "CarPlay Ultra joins CarPlay" - not that it will update or replace it. So if you've got CarPlay in your Toyota, you will continue to have CarPlay in your Toyota. If you want CarPlay Ultra, you will have to replace the whole car.