I'm hopeful for a TESB themed playset. I feel like Echo Base may be a bit played out, since we've had multiple Hoth playsets over the years (vintage, POTF2, POTJ, SOTDS)
Other ideas? A Star Destroyer bridge and Vader's chambers. A Dagobah playset hasn't been done during the modern era. Or perhaps a more broadly done Cloud City playset. The POTJ Carbon Freeze chamber is almost 20 years old, and an update wouldn't be a terrible idea. There are also some of the other duel spaces, like the room with the window and flying objects, or the gantry where Vader made his revelation.
I'm also really curious about what we can expect in terms of figure reveals. I suspect a lot was held back from the TVC line from TROS, so maybe Hasbro will finally be able to show some things from the movie. And I'd definitely like some more from the Mandalorian.