My first and greatest love in D&D is the Planescape setting by Monte and Zeb Cook. This has no small part to do with my affinity for the Cypher System, but it also means that every new edition of D&D that comes out makes me think of running a version of Planescape. Like a lot of people, I think that 4e made it difficult to have the same feel for the game. Personally, I really liked 4e and enjoyed exploring it but whatever side of the Edition Wars you ended up on you probably have seen 5e as a blast from the past in terms of game design and feel.
I’m once again going to take up the Planescape mantle to create rules for running it in 5e. This is the first part, but there will be more coming!