I think Sora will still become a Keyblade Master. Yen Sid said that if they are able to get out of the Dream World, they would become masters, but he didn't give time limit (I think). According to Goofy in the secret movie, Sora was just taking too long to wake up. I think Kairi and Lea will have a big role, just like Braig had since BBS, but they won't become masters (like Ven). Master Eraqus will be one darkness, and Marluxia too (possibly). They could be new caracters between the new organization (nobody's thought of that). They will all fight in different places, like Castle Oblivion, Destiny Islands, Traverse Town... but the final battle will be in the Keyblade Graveyard. I can't think about how Terra will be back, but I think Ven was waking up in the ending of 3D (look at his head moving). For Aqua, I think Mickey already talked to her and she'll stay in the RoD for sometime, and he will tell her when to come out. He will enter there thanks to Sora and Riku. We know Riku has darkness, but Sora will have a mixture between light and darkness. I don't know what'll happen in the Keyblade Graveyard (I'll leave that to Nomura). So, what do you think KH3 will be like?