iTunes Package Film Specification 5.2.18 update.

The iTunes Package Film Specification contains the following updates:

HDR and 4K Previews
4K HDR is supported for custom previews.

Minimum Storefront Requirements
The following territories have been added to the Minimum Storefront requirements table:

Country	Required Language Component
Japan	Japanese
Thailand	Thai
Bahrain	Arabic
Egypt	Arabic
Jordan	Arabic
Lebanon	Arabic
Oman	Arabic
Qatar	Arabic
Saudi Arabia	Arabic
United Arab Emirates	Arabic

Note that Japan and Thailand have additional requirements of localized poster art, title and synopsis.