It really depends which ideas you talk about. A light type? Somewhat farfetch'd, still possible. You're right about when we go into supereffective/not effective and details and all that, but that's the fun! Speculation and coming up with our own ideas. Someone could be right. Less so with a total reorganizing of the type chard, but slightly possible. Other things, like field advantage, aren't as farfetch'd, as they've been done in other games and by the looks of the field in the trailer it's possible they could do this. No clue as to whether they will, but still. As with the last one, coming up with details may not end up HAPPENING but it's still fun to create ideas. It all comes down to what you're talking about. You have to be clear, as many ideas have been shared here, what are you really talking about with this comment?