Writing new scenes to insert into a more or less complete story is quite tricky, because you've got a defined start and end point, which necessarily cuts back on creative freedom. It took me three efforts to get a decent first draft of the new scene (not quite in a fit state to be seen by beta readers, yet), but I'm pretty happy with it.
Most of the changes are one-line issues (improving a sentence, or suchlike) which can sometimes be a matter of a moment, but can be surprisingly tricky. Even if this is the final redraft I still need to do the dreaded proofread (especially dreaded now, as, for the first time, I'll be releasing a physical version of the book).
Two redrafts is fewer by 2-3 than Bane of Souls or Journey to Altmortis, but I did a lot more revising/redrafting along the way (many thanks to my excellent beta readers for their invaluable assistance with this). In addition, the story's simpler and has a much smaller cast, reducing the potential for continuity errors or needing to add bits so the story is more coherent.
It's too early to try and predict a release date, but I'm hopeful it'll be in the next few months. Before it's out I'll run a contest for a free e-book copy (I'll probably do that when I start the Proofread of Doom).