Don't like they way lock screen notifications blur-out the entire screen -- before, they were in boxes over the background image. I know that blurring-out the screen makes the new, unboxed notifications easier to read, but since there's usually a notification of some sort up there more often than not (at least for me), it kind of defeats the purpose of having a pretty picture there at all =P

In Mail, while in the mail-list view or when reading an e-mail there's no longer an indication of how many unread mail messages are left -- you have to go all the way out to the Mailboxes view to see that.