SE decides, not E3. that just means they ignored your petition, it doesn't mean it's not coming. They still haven't given us an answer, the rest of us will wait to get an official answer from SE ourselves.
The fact that they HAVEN'T said anything is enough, if there was anything to say we would have heard it, their silence speaks for itself. Game companies don't make announcements on what they're NOT going to do, I don't hear Nintendo denouncing a sequel to the 80's NES game "Wrecking Crew" THAT MUST MEAN IT'S COMING OUT NEXT WEEK! No, it doesn't work like that. The fact that Square Enix had the largest opportunity of the year to say something regarding KH2:FM outside of Japan, and they chose to say NOTHING is proof enough that there is indeed nothing to say.
Square Enix never made a statement on KH1: Final Mix never being released outside of Japan, yet lookie here, 4 years later and we still don't have the game, and Square Enix still refuses to make comment on it. Why? Because Companies don't make statements on what they're NOT going to do.
E3 is the largest video game related convention outside of Japan, E3 was Square Enix's chance to tell anyone outside of Japan what they felt needed to be said, and they said nothing. If Square Enix had an international release of the game planned, they would have stated so at one of the only opportunities of the year in which they have to make such an announcement, when the American audiences are watching and listening. They said nothing, they've said nothing for the past 6 months, they've said "it's not in the cards", it's simply
not happening
Square Enix is notorious for being completely steadfast in keeping their Region-Specific Special Edition games in those regions
only, KH2: Final Mix is no different. They want it in Japan, it will stay in Japan. We're not being negative, we're being
realistic, we're not getting our hopes on something that all odds point to it not happening, and we're not going to waste hope on the hopeless. I'm telling people to accept that it's not going to happen, because I was there to see people waste years hoping that Kingdom Hearts 1: Final Mix would leave Japan
It's better accept something as hopeless and move on (perhaps to be happily surprised to be proven wrong if what you thought hopeless turns out to happen), then to keep your hopes up and assure yourself that it's going to happen, only to have your hopes dashed and stomped on realizing you wasted months/years anticipating something that you should have accepted was not going to happen.