Yeah i think Atlantica will be playable because Atlantica has been in all KH games before right? well i think it would be kinda neat to have it in BBs as a no Heartless free zone like in kh2. Where u can play minigames to have fun u know in stead of fighting heartless all the time,thake a break and have sum fun in Atlantica.
I am agreeing yes Atlantica in BBS will be a smart move for only one reason and that is because i would love to see how terra, Ven,and aqua will favor in that world so yeah that may be a great addition to bbs or may not we will never know unless we see it.