DCPB has a new hint for Frame 4. The 13 black circles form a P-like shape, though I like commenter Catie's opinion that the 13th circle shouldn't be there, as though the other 12 are part of something and the 13th messes with it. So where does that get you - a baker's dozen... fitting in with the previous Crumbs bakery theory.
So looks like some fans will be gracing a bakery? Buy me one of those cupcakes, anybody?