Yea, pretty much. I'm assuming they will, but I hope gym leaders like Shade, Florina, and Julia come back. So far the only one we know that has a plot after you beat them is Shelly and from the teasers you can infer Radomus will.
I hope so, but you will most likely see her again either way because you didn't get your badge. Maybe she joins you after you battle her.
I just want the gym leaders to come back in some way and not just cast away after you beat them. Actually have them come back as part of the story and have real plot, not like N's castle in BW.
That's what the development board is for. Check out some topics there. I know there's still some coding ones open. The game is coded in Ruby by the way.