Just found this synopsis of the upcoming episode, which is the second part of the Silence in the Library story that starts next Saturday:
As the shadows rise and march, the Doctor forges an alliance with the mysterious River Song, as Russell T Davies’s Bafta Award-winning time-travelling drama continues. But can anyone stop the Vashta Nerada?
While the Doctor discovers long-buried secrets and revelations about his own future, the sinister Nodes declare that Donna is doomed.
David Tennant plays the Doctor and Catherine Tate plays his companion, Donna. Alex Kingston, Colin Salmon and Steve Pemberton guest star.
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forest of the dead!
episode 8
series 4
cant wait
i think river song might die because in planet of the ood an ood say. your song will end soon
I forgot about that!!! So maybe the “your” song implies some sort of attachment - like his wife? Other blogs have speculated this, or maybe a future companion.