Im not sure whether this is the correct place for this thread but as since this is related to Mavericks and the rMBP I might as well post it here and have it moved later if needed. Just today I let my macbook run to zero juice in the battery and just figured to check if it was really out I'd power it on. And this is the screen I was greeted with (in the picture below)! Maybe everyone is aware of this, but if not I thought I'd share as I've never seen this before. Just goes to show further that iOS and OSX are merging, because as far as I'm aware this is the screen you get when an iPad or iPhone are out of juice and you try to power them on.