All across the universe, and even spilling into a neighboring universe, people have suddenly woken up and remembered. Remembered the Doctor...and remembered an alternate life lived without him. Although those lives are gone, vanished with the return of the Doctor, those memories linger, as do the perhaps confusing memories of the proper time line with the Doctor, and--to all but few--no discernible reason why they would have suddenly forgotten.
Amy, Rory, and the Doctor may be on their honeymoon, but the universe doesn't stop even for the most incredible holidays.
The Voice is still out there, the danger still looms, and at any moment...it might just strike.