When I checking in for Thursday's flight on Wednesday I was in C+ (I checked my seat just prior to checking in). After checking in I went back to take a look at where I was on the UG list and there was no link available to display the list. I then noticed I had just been upgraded which I thought was strange to begin with. And then I noticed the fare class was OU which I don't remember having seen before. I had originally been in Q.