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.