>>4436455Take note that River's ultimate fate was in the episode where she met the 10th Doctor and prior to meeting him, she was given a Sonic Screwdriver by either the 11th, or future Doctor (she will be a companion to the Doctor, eventually, as she said so herself and according to her diary).
So despite what we saw in the season premiere, it still hints that the Doctor somehow managed to be around after than and eventually reach his next re-generation (there said to be a reunion special next year featuring the surviving Doctors).