I think that Rory moved into a different dorm room her sophomore year. I don’t consistently watch Gilmore Girls, so I don’t remember if this was ever stated or if it was ever shown that Paris and Rory moved, but the room looks a little different, Rory and Paris don’t share a bedroom now like I think they once did, and we haven’t see the other two roomies this year.
They did establish that Rory and Paris moved to a different place this year. As for Tonna and Sporto (Was her name Janet? That doesn’t sound right.) we’ll never know…Tonna was a fun character. I would have liked to see more of her.
Kind of like the first or second season episode with the Chilton Sorority and they introduced a friend for Rory who NEVER appeared again.