This kind of sounds to me like what you were saying when the news of ORAS broke, about how there would be no new Mega Evolutions...
I don't particularly care about new moves one way or the other, so while I'll take the role of devil's advocate here, I don't think they're going to play Gen VI the same way as any prior generation, for reasons the I've explained before. Anyway, it seems to me that the hidden moves, which are not just "event exclusive" moves, but in fact the signature moves of "event exclusive" pokemon, and thus, are only included in the data because they are. The Thousand moves are where my argument falls apart, in large part because there's no definite pokemon to tie them to. It's largely speculated that they will belong to Zygarde, but that doesn't necessarily mean anything; they could belong to Kyogre and Groudon, for all we know. That's where my argument falters, because not enough information is known about them. It seems to me that they could have just been included as a red herring, to make us chase our tails in circles, trying to figure out what they mean.
So, while all of the hidden moves may or may not have relevance to Events, as signature moves or not, Kyogre and Groudon will not be event legendaries, and so there would be no need to preemptively include hidden moves for them in X and Y. I do know, however, that Kyogre, Groudon, and Rayquaza are the highest tiered legendaries who lack signature moves of their own, and who's abilities, which formerly set them apart from almost every other legendary, are no longer unique to them, and have in fact been downgraded. If anything were to be given new moves mid-generation, it would be they, and as I've pointed out before, GF doesn't have to play by same rules as they had to in the past.
