I do not yet own an Nvidia Shield TV but I had questions about the Movies Anywhere app that was released via the 11/22/17 update.

Does it allow 4K playback either through that app or through the Google Play Movies app? And even if you bought a 4K Dolby Vision movie on iTunes, would it play back in 4K HDR10 via Google Play Movies (assuming the movie was listed to purchase in 4K on Google Play Movies)? Thanks

EDIT: Also I think it may be too good to be true, but theoretically couldn't all Android users take advantage of Apple's iTunes HD to 4K free upgrades with all new movies releasing in 4K? If not, would it work to remove iTunes from your Movies Anywhere account and then re-add it?