Howdy again, Ceri!
Thanks so much for your comment... it means the world to us that you've stuck with the series the past year, and we really look forward to hearing your thoughts on the sequel once we finally get there. We've still got a long journey ahead of us!
Without giving too much away, we can tell you that the final installment will follow a new protagonist, yet unintroduced in the series... though Nick will be playing a very large secondary role, and Katie will most definitely make an appearance. In fact, keep your eyes open for some Katie concept art for the sequel... we've been getting a lot of requests for her!