I have been informed that they are also now placed in the 50's too. I found out that any large group (Brazilians, 15s, cheerleaders, etc....) can now be put in the 50's just as likely as the 80's / 90's.
50's was my favorite and I didn't understand why I was moved from my favorite area. I have 131 nights at POP and have become 'friends' with some of the staff. They assigned me to the 70's my last two trips (both this year). At first, I wasn't thrilled but now after 2 trips in the 70's, I actually really like it. I generally don't use the pool and I like the quiet and I get quiet there!