There were two major DNF Duel announcements at ArcRevo Japan 2022, concerning Spectre showing up as a DLC character and a Nintendo Switch port of the game.
The teaser for the DNF Duel Spectre DLC, however, is available already. It doesn’t actually show her in battle.
A Switch version of DNF Duel will appear in Spring 2023.
First, the official trailer teasing the DNF Duel Switch port isn’t on the official YouTube account as of 11:45pm ET on December 3, 2022.