The one on hold is the next one to follow Brann's story. The plan for these books always was to write a trilogy of trilogies, forming in total one overall story, so this is the first in the second trilogy. However, the harsh reality of publishing is that, because of the way that first three (the Seed of Destiny trilogy) were produced as a digital project and were not regarded as a more mainstream publishing contract would have been in terms of investment and marketing, the sales - while encouraging for a first-time author - not sufficient for a new book in the series to be financially viable. However, it is ready and poised to be unleashed on the world should the situation change.
The new book is a completely different set of characters in a completely different setting and time. With the provisional title Blood of Antiquity, it is post-apocalyptic where great cities have regrown with lawless lands between and where technology has largely recovered to the level of the early 1900s. It is a a bit grittier than Hero Born et al, and follows the story of one character but that story is told through the eyes of several characters, all of whom I hope you'll enjoy reading about. The first draft is now out seeking an agent, so I am at the 'hopes and nerves' stage!
I'll keep you posted if/when there is anything to tell.