Joseph1957: Ragnar Tørnquist has to be careful that he does not create more questions than answers before he wraps up some of the un-answered lose ends in the previous books first, or we will need a book six and possibly a book seven to complete the story.
Absolutely. This is essentially the Telltale problem in a nutshell - often enough, they found out by the fifth episode that they could never wrap up a story as complex in just one episode. Telltale's decision however was episode dismemberment. Crucial, brutal cuts that drove e.g. Tales of Monkey Island deep into really bad ending territory. :(
And there's MUCH to resolve in Chapters. We haven't even met all the villains from the predecessor!
However, Ragnar has started delivering answers with Book 3. For me personally, I think the April question has been answered already, as was the Zoë/coma conundrum (the latter will probably be made far more explicit... the first possibly not). The evil plans cross worlds are known, it's just that we need more detail. The protagonists now have their individual plans and goals.
There will probably still be question marks swooshing around our heads by Book 5, but the crucial questions, I hope, will be answered satisfactorily or at least implicitly.