Kristin Hello. I follow Kalayna on Facebook and she recently apologized for the hiatus. She announced Grave Visions will be out in February 2016.
Elusive If it isn't pushed back another year when nearing release date again. Anyhow I will not be reading this, as it feels pointless to have to wait 3 years for the next release again after this one. Nope this series is dead Imao.
Manuela Hudson-hiscock The release date is set for March 25, 2015 according to Risingshadow.net. Amazon shows that it has it on Kindle for $7.99. I don't own an ereader (I'm a paperback girl) so not sure how that works. Hope this was helpful.