Book two is completely through the initial write at around 75k words. I expect it to grow another 20-25k by the time it completes. The story takes a much darker turn with the introduction of the primary antagonist. You will soon get a glimpse when book one (Nightfall) releases October 20th, 2017.
Book two will be called Arklight: Operation Interdiction, and I have a working outline for book 3, Arklight: Task Force Crusader. The story continues to develop and grow in new and exciting directions! Book two could get released for publishing in March 2018 if I stay on track and look out for a strong new female hero to emerge (foreshadowed on the cover of Nightfall).