i think it said something like this:
"Sora, Riku, and Kairi, thank you for helping me with the Heartless/Nobody problem. but, before i tell you about the next mission i'm sending you on, i think you deserve to know about how this all began. it was about 10 years ago when this started...
...their names were Terra, Aqua, and Ventus..."
and then it starts BBS.
i mean c'mon, hasn't at least one of u wondered how BBS was gonna start? that, plus the fact that u all thought SE would completly leave out that ending from all of the new games, just 2 wait 4 a kh3, 10 years after the second game was released.
in fact, i'm betting that's how all 3 new games will start off; w/ Micky's letter telling them a story from the past that he has either already known or has gathered from eavesdropping on ppl from the organization while he was gone from his castle. except, the letter will only tell the story of the game ur about 2 play and it won't even acknowlege the other stories were told at all.
well anyway, the letter either says that or this: "Riku, meet me at Pen Island; i have something 2 show u. ;D "