This is kind of embarrassing, but I forgot to mention that Empty Horizon is live now...
Glad we're past that. For those who are interested in this kind of thing, the debut went well. It topped out at #200 in the overall Amazon Kindle store and reached, I believe, #3 in Swords & Sorcery and about #10 in Epic Fantasy. I was nervous, because it released shortly after Brandon Sanderson, Jeff Wheeler, and on the same day as Nora Robert's new Epic Fantasy. Poor timing, but it worked out Ok and I made my release goals.
I've finished up the outlines for Book 5&6 and I started writing Book 5 today. It's shaping up to be a bit longer than the others, and pretty action packed. Expect it 2018.