I will be very disappointed if the new Apple TV doesn't supports 4k. I wish we can buy a more deluxe version with 4k at least. I can still rely of the smart TV for 4k content, but would love if Apple starts supporting it.
Like a said in the previous post, I wish we could get resolution upgrades on itunes: This is where I think having a movie collection in the cloud could pay off. For example, SD to HD +$10, SD or HD to 4k +$15