look i saw this video on youtube that shows sora and terra meeting in one of the games in think it's kh2 but im not sure. i highly doubt that it is the first cut scene in kh3 though. please tell me what u think it is.click on the link below to see the video if that doesnt work just copy and paste.
YouTube - Kingdom Hearts 3: First Cutscene: Terra's Awakening
YouTube - Kingdom Hearts 3: First Cutscene: Terra's Awakening