[Will we see Jokertown again?]
We'll check in on Jokertown eventually, but it doesn't play a big roll in the current triad.
On the other hand, Jokertown is the main setting for Daniel's comic, THE HARD CALL.
[Whether the Great and Powerful Turtle will appear again.]
Maybe somewhere down the line, but he's essentially retired. He's almost old enough to be collecting Social Security by now. And that hot young girlfriend of his tires him out.
[Will "The Committee" be significant?]