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It's actually not OTA update, the maps are downloaded from their servers since it's a cloud based nav. It's just like Google maps on your phone - no need to update your app or phone to get newer map images. It just depends on how long the cache that is on your car and it is forced to refresh the maps to your car.
I hope these 'improvements' don't become a regular thing - I like the understated appearance of the nav display. If I want garish, cartoony graphics I'll drive my wife's Highlander.
Toyota and Lexus Join Mille Miglia For The First Time
Slideshow: A five-car lineup spanning more than five decades of Toyota performance and engineering will tackle one of Italy's most celebrated automotive routes.