I just read a developer comment on the mdsoa steam page that the writing for Echoes hasn't started yet. This page asking for pre-orders specifically says, "Coming in Summer 2017." How can the game be released this season then?
Will all routes be released at once for this VN or will they be staggered like in the first game?
All at once. It is a game with a common route. We won't likely ever do a game quite like MDSOA in terms of how we released it again.