I really think this set will change the meta-game, but the thing is we might not see many of these cards until after Worlds which would mean we will be getting a new format to begin with.
Another thing that I noticed with some of these cards is the ability to move and get energy fairly easily. I'm just shooting in the dark here but maybe they're planning on not reprinting DRE, Scramble Energy, and some of the other cards like that. If those energy cards were not reprinted for the next format it would slow down the game, and so to make the game faster again they give more pokemon the ability to charge up faster. It's probably a stupid theory but it might be true. Who know?