Well, if it is Hazel, she would likely be in Autumn's room, as her roommate, Vanessa could be, so could Eris, or Zara...Logically, the next tenant should be Hazel. Right now, each room has two tenants (Lin-Jin, Kali-Lucia, Ashley-Fairies, Maria-Hana, Android and her child, Felicity - Emma), we shouldn't leave Autumn alone. For the last room, personally, I prefer Vanessa - Nia to move in together, Kim - Ami sisters could be a good choice, too.
Hard to say, Vanessa is a side character for Kali though, so that doesn't seem too likely. Same with Kim and Ami, odds feel low.
Zara started as someone who was unaffiliated, but now she is Luci's friend, so hard to say there...
He said that whoever it will be, was someone who was not in the game at the time, but I can't remember who all has been added since then, or if things have changed since then.
Wheelie is still a strong contender, but it is all pretty up in the air.