A proper training mode will for sure be added at some point, but it takes a while to get one set up. There's a bunch of small things that a good training mode needs, and I'm aware that it's annoying to have to play a VS match in order to practice with different characters.
As for EX moves, I plan to use the campaign mode to demonstrate different game mechanics, but I also want to do more than just make a glorified tutorial.
Thank you for your suggestion!