They could certainly release a new set of 2E quests that are thematically similar to the old 1E quests, however, the amount of rewriting that would be required to make most of those quests work in 2E mechanics would be pretty heavy. It's not just a matter of picking 2E tiles that build a map vaguely similar to 1E quests and sprinkling in some 1E monster groups.
In D1E, the Heroes' goal was almost always to kill the Big Bad. Occasionally it was to find a macguffin, which generally involved killing a Big Bad to accomplish. The Overlord's goal was always "kill the heroes until they run out of Conquest Tokens."
In D2E, where heroes can keep standing up forever, the Overlord, at least, would need new goals. I tried rewriting the quests that way when I started my conversion package (above.) I soon realized just how much work was really involved in doing that - even if I tried to stick close to the original material - and so I gave up and re-added Conquest as a mechanic.
However, with this new co-op expansion coming out, there may yet be hope... Rewriting the D1E quests as co-op would probably be doable. Heroes have goals, game engine tries to kill them a lot...