During the secret ending as AtW speaks with aqua ..he mentions that it's been a year since he last saw sora. the last time he had actually seen him was when his heart decoder blew up at the end of KH2 and he disappeared. my guess is that upon its explosion, Atw was transported back to the realm of darkness and hes been there ever since. Seeing as how that scene takes place a year after that ..i would also surmise that "KH3" and sora's next journey will already be in motion during their conversation. Now assuming this is true? ..it would mean that Aqua has been in the realm of darkness for roughly 10 years (anyone notice how she hasnt aged a day?), and Ven still remains at Castle Oblivion in the room of awakening (as an empty shell) ..Im curious as to whether or not Terra is even apable of being saved though with both Ansem(heartless) and Xemnas have been defeated ..If apprentice Xehanort were to somehow be reborn within kingdom hearts since his heartless and nobody have faded? than i suppose he could be sperated once again into Master Xehnort and Terra? ..If sora could make his way back to castle oblivion and restore Ven, resque aqua, and find a way to seperate apprentice xehanort and thus save terra ..perhaps we will se a massive showdown with sora, riku, mickey, aqua, terra, and ven VS. Master Xehanort at the end of KH3