Yes, beefcake, Joe confirmed it will be part of the Frostgrave Folio.
And I'm very curious about the Foulhorn. Is it a humanoid? An insect or hairy thing with four arms? I dare to ask the creator himself: Joe, how did you visualize the beast? I'm intrigued also about their alliance with North barbarians. Are they suppossed to appear in the incoming Forgotten Pacts (in a scenario or in miniature)?