These three titles are in development by Stephen D. Sullivan and will be announced when they're approaching publication.
To tide you over here's a link to Steve's publishing house Walkabout Publishing where you can find Blue Kingdoms: Zombies, Werewolves, & Unicorns (featuring a Unicorn Cavalry story) or Martian Knights & Other Tales. You can also find those books on Amazon.com. Click Stephen D. Sullivan to go to Steve's main prose page and read about those books and many others.