User blog comment:XGlass Reflection/Ch. 54 Review~ Erwin of the Rebellion/@comment-76.208.146.99-20140220002635/@comment-179280-20140221053626

We've explained a lot of times already that there won't be a new season until there's enough manga material. That means, it will take about 2 or 3 years (if they don't take the filler-arc route).