UltraStudio 4K Mini Cut & Fill

Will the new UltraStudio 4K Mini do cut and fill at 4K resolution?
The now discontinued UltraStudio 4K could only do cut & fill at 1080P.

Yes, it can do fill and key at least up to 2160p30. I am not entirely sure about 2160p60.

The press release for the UltraStudio 4K Mini (https://www.blackmagicdesign.com/media/ ... 0190808-02) says the following:

UltraStudio 4K Extreme 3 and UltraStudio 4K Mini feature the latest 12G‑SDI, for the most powerful video capture and playback solution. The incredible speed of 12G‑SDI means UltraStudio 4K models can support both capture and playback of Ultra HD and 4K 60p over a single BNC cable... Because the 12G‑SDI outputs are dual link, customers can do stereoscopic or simultaneous fill and key in real time up to 2160p30.

This is a little unclear as it seems to be describing features of both the UltraStudio 4K Extreme 3 and UltraStudio 4K Mini, and then also groups together the specs for stereoscopic 3D output and simultaneous key and fill. And at least for the UltraStudio 4K Extreme 3, the maximum output resolution for 3D (2160p48) is different from what it is capable of in keying mode (2160p60).

Usually the definitive list of what keying modes are supported are mentioned in the IDeckLinkKeyer section of the DeckLink SDK documentation. Unfortunately, however, the DeckLink SDK documentation has not been updated to mention the UltraStudio 4K Mini yet.