Wow, a five book DS9 set for the 20th & now this.
I think you've missed an update or two. The 5-book set is The Fall
, a multi-series crossover that begins with a single DS9 book. When that first book was announced as the start of a 5-book series, there were a couple of people who speculated that the whole 5-book series might be DS9, but those speculations were quickly proven wrong by later updates.