I also have to agree with the OP. Not printing an overview because you don't want to reveal the twists is pretty stupid - the overview is for the DM, who should have some idea of where the story is going, not for the players, obviously. I wonder if the staff is so overworked they can't task someone with writing some 1 paragraph summations of the adventures, or perhaps if they don't have the entire AP nailed down yet. This, along with continuing to use the pain-in-the-ass delve format (while using a much easier to read format in the physical adventures that they're publishing), really makes me wonder if they knew what they were doing when they took back the magazines.
Also, would it kill them to list the intended levels for an adventure (a) on the download page, and/or (b) on the first page of the adventure? Why do I have to keep hunting through the first few pages for this info?