I am going to tour the new grad student dorms next week. I will let you know what I find out. At this point there are 3BR townhouses that you share with other students. Studio apts and the new dorms, which will have a few singles and then everything else will be doubles. I was told that the grad dorms will have a bathroom for each room so at the least you won't be sharing your bathroom with 20 people.
The one thing that I know for sure from talking to other students is that 4th years get first priority, then 3rd year, then 2nd and 1st years get what is left. Most 3rd and 4th take the townhouses from what I have been told and then the order of occupied housing is that the townhouses get taken first, then the studios next. The college used to have a lease for 3BR duplexes but the developer for the island didn't renew the contract and it was a big stink because students were kicked out of the houses at the end of last year.
One thing to consider about on-campus housing. Absolutely NO PETS!