I'd rather the space was used for a small but related stand alone adventure, like the ones in Legacy of Fire (which could be 'slotted in' between AP books).
The blurb had the opposite effect on me. When only the first book was posted it sounded like an interesting mileau-the whole Ice Queen/ Eastern Europe snowbound take. But the later digressions into world hopping and the 20th century just sound too silly to be bearable.