I read at forums and tweets that roommates are Suho, Sehun, Yixing and Luhan,   Kris, Chen, Kai and D.O  and Xiumin, Tao, Baekhyun and Chanyeol. But it's not all true. The only thing true about that is Chanyeol, Baekhyun, Tao and Xiumin are roommates, since it was mentioned during Xiumin's Birthday Party.

   I saw this on Twitter just now: 

[fanboard] Luhan: Me, Sehun & D.O shares a room~ cr:DeerestExo

   So, the members left unconfirmed are Suho, Lay, Kris, Chen and Kai. They may share a room or they are split into two rooms. I feel that they shared ONE ROOM, so that the LEADERS could keep on those three somewhat mischievous members.