The PokéBall Vivillon was found by the people who hacked the games, along withIt could be in XY and we didn't know it. Didn't they just release a new Pokeball Vivillon? I don't recall that being discovered earlier than its announcement.
Spoiler:
AZ's Floette, with its own attack; Mega Latios, Mega Latias, their respective stones; and two other legendaries, Volcanion and Hoopa.
Why would there not be a patch? :P This isn't a new generation.
Though if there isn't I'll be a little pissed...
Actually, I agree with you. I do think they will patch the games. I was only bringing up the possibility since I know there are some people who are very dead-set in their opinion that the games will not be patched.