as you can tell by my avatar i'm an ardent Squall admirer but i think in terms of story's they will concentrate on Cloud rather than Squall. not that i think he's cooler, but Cloud's conflicts involve Sephiroth and (probably) aerith. Cloud's got the whole dark and stern thing going on...
as for Squall i think his conflicts are completely internal. I am VERY VERY confident that he will play MAJOR roles in KH2, since Squall is (confirmed) the leader figure of the the Final Fantasy characters from Hollow Bastion. why? it's in his character, you know that when they integrate the FF characters with Disney they disregard most (if not all) storyline to that FF character, the one thing that remains are their roles... Cloud is the dark mysterious guy (like in FFVII), Yuffie is the happy go-lucky girl, etc... just like they are in the original games...
seeing as Squall and Cloud are the more important of the FF characters (them being game protagonists) they will have great roles and emphasis in KH2. i just know it...
btw, don't ask me "what do you mean 'confirmed'? where did you get the info", if i told you that i would have no need to post now would i?...