Excited for this. I'm only a few books away from it in my DS9 reading scheme!
And yes, I'd love to see the Defiant reregistered to the NCC-74205-A. As we've seen/heard form the show runners numerous times, that was certainly the intention, but the budget wasn't there. At the very least, changing it to an NCC.
I remember bringing this up when the final cover art was revealed. The lack of a change to NCC annoys me way more than it should.