I actually thought the voice at the end sounded like Craig Owens from the department store and the previous Doctor. But that would have been so cool that it would have opened a rift in the fabric of space and time. Again. So we wouldn't and couldn't see or have that.

That would make a lot of sense and be one of the coolest things on the show in the past several years. Like in Alien when someone asked Ripley "Aren't you dead?" Or in the cartoon Invader Zim "I thought the Tallest KILLED you!" "Yea, but I got better." Since it would kick ass and be really cool I doubt we will see…