So in "The Impossible Astronaut", they have to cremate the Doctor because, as River says, "A Time Lord's body is a miracle, even a dead one. There are whole empires out there that would rip this world apart for just one cell".
In "The Doctor's Wife"? There's a whole pocket universe... filled with bits and pieces of Time Lords.
Add that to the regenerating child, and y'all, we have this season's lurking theme.