** Possible Spoilers for anything up to and including Harbingers **
Been thinking about what might be in the upcoming Bloodline and I bet I'm not the only one.
Based on the title...
I'm sure we'll see more of Diana and the Yeniceri (whatever is left of them).
I'm also thinking this is the book where Jack and Glaeken will meet. In a bit of really wild speculation, I've been wondering if maybe there is a familial connection between Jack and Glaeken. Why else would Jack have been selected as an Heir before he ever became "Repairman Jack"? Ok, maybe it isn't a direct line - I think I recall reading that Glaeken never fathered any children, but do we know that he didn't have any siblings? Maybe Jack and Glaeken are of the same family.
And it might just be wishful thinking, but maybe we will also learn more about the Ladies with Dogs. They also seem to have a "bloodline" connection of some sort.
Seems like I had other ideas, but it's late and I can't think of them just now. So anybody else care to speculate?