The preview '0 edition' book is softback, but we don't know what the final 1st edition book will be like yet.
If Chaosium follow the same pattern as they do with new Call of Cthulhu editions, the mass production of the book will be in softback, but their may be an early print run of hardbacks too.
Nothing guaranteeed, of course, and I'm not 'in the know' myself, but I'd say that there is a reasonable chance that everybody on this site will get hardbacks if they want.
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