That Ascendants story that we've been teased with between 'Soul Key' and 'Rough Beasts' would be nice, as at least a duology if not a trilogy, not two books slammed into one (which, yes, I know, is more due to availability of slots over a desire to just get them published and out of the way, but this IS a wishlist). Also, while I'm on the subject, I have been a firm believer that there should be an anthology for the time period between Soul Key and Rough Beasts timed for the twentieth anniversary.
Also, I want an IKS Gorkon epic about how Klag got promoted and the epic fight with the Kinshaya. Maybe, somehow, Kat could guest? Because I liked her in IFM, and want to see her again.
I'd also like to get another anthology about the various races, something in the 'World of DS9' style with some of the races that haven't had the spotlight as much as others.
That Ben Sisko Lost Era novel about the Tzenkethi War would be a nice addition as well. Now that we know what they look like, I'd like to learn more about them. The glimpse from Rough Beasts just left me wanting more.
I know it's unlikely due to the issues with the four delayed (I hope they're just delayed) stories, but I wouldn't say no to a Kelvin novel. Just something to give these characters a little more resonance.
Also another Captain Pike novel would be a fun read, especially if it included some of the Early Voyages cast. I'd really like it if it could be a conclusion to that cliffhanger, though that's probably unlikely.
And as a personal preference, I wouldn't mind getting a few more stories set during the run of the shows themselves outside of the occasional TOS novel. As much as I enjoy the ongoing adventures of the crew, sometimes it's nice to revisit them the way they used to be.
Oh, one more thing. I'm rereading the Q Continuum trilogy, and I'd be interested in seeing the plot thread of the Tkon Empire's sun device being picked up at some point.