I bet Clara thinks that the granddaughter the Doctor mentioned is also River’s granddaughter
it’s actually pretty funny to look at the tidbits of information that each companion knew and imagine what conclusions they must have drawn xD
I would love to see her bring that up with River (WHEN River comes back)
I honestly don’t think she’s coming back. Before the finale aired, Moffat said that he was going to wrap up a major character’s story arc, and it’s quite obvious that it was River. Besides, judging by Moffat’s comments, it sounds like he wants the Doctor to move on with Clara.
and we did see the wrap up of a major characters story arc, the great intelligence. and River is far from wrapped up, there is so much more, she can just pop in at anytime. also moffat says that he loves writing for River and Alex loves playing her so there is no reason for her to leave (given that there is so much more they can do so she isn’t out of plot lines).
He also made it sound like we’d see more of the whole Singing Towers thing than just the bit in Last Night. But no one can know for sure what he’ll decide.