According to web site Stevivor, Microsoft has confirmed it will release 4K game assets only for Xbox One X consoles, eliminating the need of extra data to earlier models.
“With the launch of Xbox One X, when it comes to game content our intention is to download the correct assets to the correct console,” a representative from Microsoft told Steve Wright after being questioned how each Xbox One model would take care of downloads. “This means, regardless of the TV you are playing on, 4K assets will be downloaded to Xbox One X (if available) and the standard 1080p assets will be downloaded to an Xbox One S.”
Owners of Xbox One S consoles won’t be getting real 4K content, mainly because this model uses 1080p graphics upscaled to 4K.
Microsoft also told Stevivor it will offer “developer tools to make downloads more efficient” for Xbox One S and Xbox One X owners.
“As part our developer readiness for Xbox One X, we have made available a feature which will give them significant flexibility when it comes to what gets installed on a user’s console,” said the representative. “In addition to 4K specific assets, developers have options when it comes to language specific assets as well, which depending on the title, can drastically reduce the install footprint. This ability to intelligently install the best assets for each console and language are available on all Xbox One devices, and it will be up to the developer of the game to determine the specific implementation.”
Microsoft also told Stevivor that additional features will be announced in the months to come.
[Source]: Stevivor: Only Xbox One X will download 4K assets for available games.