Probably not. I’m proud of the existing trilogy; in some ways they’re my best and most subtly complex books (observe, for example, the way in Vengeance and Justice that words are echoed either from the end of a section to the beginning of the next, or from the end of one thread to the resumption of that thread), but they’re also harsh in a fashion that I no longer feel a need to be.
I actually did rough the plot for a fourth book. It’d have been Ragnarok, with Hansen taking the place of Vithar and surviving to ‘the new earth and the new sun’. I decided not to do it at the time because I’d come to like the characters—yes, even North—and decided they were in a good place so I’d leave them.
That was a good decision.