We'll probably be seeing Lorna (the girl who met the Dr as a kid). I did like her character.
She said she was from the Gamma Forests, and River said something about her name not being in the language of the Gamminians (Lol?) "only water in the forest..".
Anyway, it makes me assume the Dr would be dropping young River off there, and she grows up there, since they seem to know a bit of her.