Ho-oh, Kecleon, Wailmer, etc. If they can release a new character before the games even get released, I don't see why they can't do that for the new generation. Technically, it's possible. But looking at it realistically, they won't ever do that. At least not for this generation. They announced a world-wide simultaneous release in October - and they'd want everyone to get their first touch on the games in October. In other words, make everyone wait and hype for the game without providing any info through other merchandises. Gen 6 won't debut in the anime until after the game release.
So it's more likely that a separate arc like BF or another mini-tournament will take place. Something to wrap up Unova and all the unfinished stories of the rivals, Cilan, etc.
And this is just out of curiosity,
Does this really matter much? I think that's just a case of dubbing since the episodes were just already out there.The first two BW episodes aired in the US in February while the games came out in March.