Would the death knights storyline be reflected in the book?
-> There will be multiple books and definitely Death Knights will appear once again with Zylcious. In the first book they will not appear, as it is full of a lot of other stuff. I mean for example I will explain very closely Umnia, Gadezka, Saoloth and Balgaron countries and their own organisations. Also many new enemies will appear(Shadow Guild, Imperator ...). Death Knights will come eventually too.
Axobada
-> Axobada is very important character to the whole plot. He's will definitely come, as he's linked to Tharo, Zeemnan and Gheiz(main character of the book).