The sitemap leak is turning up a goldmine of info. The 6.1-inch iPhone will indeed be called iPhone Xr, and it will be offered in six colors: black, white, red, yellow, coral and blue.
The URLs confirm it will have a 6.1-inch display and offered in three storage options; 64 GB, 128 GB and 256 GB.
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The updated sitemap was discovered by Allthings.how. Apple has since pulled the pages. The same leak confirms the names of the new OLED iPhones as iPhone Xs and iPhone Xs Max. It also revealed some significant physical size changes are coming to the new Apple Watch line.
The URLs show that the 6.1-inch iPhone Xr model will be offered at all the usual US carriers, but an unlocked model is not listed. Unlocked variants are listed for the 5.8-inch iPhone Xs and 6.5-inch iPhone Xs Max.
Update: It also appears there are new AppleCare packages which include coverage if the device is stolen or lost. These AppleCare plans will be available for all of the new phones, in addition to iPhone 8 and iPhone 7.