As you know, the firmware update was released yesterday with many new features, but there is yet another one discovered.
Before the update, when sorting your friends list, the order would go A-Z, but not like the real alphabet. It would be like if your name was mickey then your name would be at the end after Z, but if it was a capital like Mickey, then it would come after L. Now, everything is alphabetically ordered, no matter if the first letter of your name is a capital or not.
:y: to you for finding this, like cryptic said, this isn't really a feature at all, since you can't play around with it etc, it's more of a fix to the playstation network friend list