Since we know that the Ponds will make their last appearance in the 5th episode due to the weeping angels, one has to wonder exactly how they will go. Russel T Davies angels just zapped people back in time and they fed off their potential energy, and Moffat's angels snapped peoples necks. I think the later is a bit of a violent end for main characters, so I think it will have to do with the whole "Whatever holds the image of an angel becomes and angel" kind of thing. Maybe these angels evolve to where if you look at them too long, you become an angel yourself in a process much faster than what Amy went thru. Somehow Rory and Amy become angels and in the process they are staring at each other and end up quantum locked forever.