I might be interested in this. I don't own any other KP stuff so it will be a first for me.
Is the Night Hunters Oracle Deck a full tarot deck (78 cards) or its own custom thing?
Does Midgaard have a Ravenloft realm - like Golarion has Ustalav?
I wonder how this will compare to Van Richten's Guide to Ravenloft.
All great questions
From the FAQ:
The Shadow Oracle Deck contains 56 tarot-sized cards in a single rectangular hinge box with a magnetic closure. Each card features original artwork by Damjan Gjorgievski, created specifically for Night Hunters.
While the Shadow Oracle Deck is not required to play Night Hunters, it introduces a new optional mini-game called Shadowjack, which weaves tarot-inspired themes directly into gameplay, adding narrative flavor, heightened tension, and supernatural elements to your table.
Additional info ...
The Shadow Oracle deck is similar in many ways to a tarot deck - a suite of 'major' cards and suites of different minor cards, tarot size, with beautiful art, cool esoteric themes. The Shadow Oracle deck can be used in many ways, but it is not a true tarot deck.
Regarding the 'how does this compare to Van Richten's' question.
Like the content that appeared in Van Richten's, PCs & GMs will find Night Hunters contains an array of horror-themed character options for Tales of the Valiant (and D&D 5E of course) and concrete/helpful/modern guidance & toolbox style resources for GMs on running excellent horror adventures/campaigns.
However, where Van Richten's put a lot of emphasize on specific locations (aka each domain) and provided set dressing/big sandboxes of possible stuff to discover in locations, Night Hunters takes a different approach by emphasizing the VILLAINS themselves and provides lots of direct story beats, plot points, encounters, minions with stat blocks, etc. for PCs to face across multiple sessions or even entire campaign arcs leading up to the final confrontation with each villain. One big difference is the fact that Night Hunters provide big juicy final boss stat blocks for each dread villain, complete with full lair actions, lairs, regional effects, etc.
Night Hunters makes your horror games impactful by giving you specifically tailored villainous timelines with different events to trigger, encounters, unique minions, and exceptional villain stat blocks - a toolbox that focuses on actionable components you can use right now in any game without needing to thread together your own plot to fit within a specific given domain.
Hope that helps!