On the review(at least google translated), it says it is the "latest add-on", so it can be easily misunderstood as the "last add-on". Other than that, I searched for more info on whether it is the last installment or not, and didn't find any indicators that say it IS, but you never know, they might just move on to another game
. I'd personally very much love to see few more KB's by Katauri.
Anyway, can't wait for Crossworlds.