If I recall correctly, the 'last' reference (according to the external chronology) concerns Turin returning to the War of Wrath to slay Ancalagon... or at least Christopher Tolkien has argued that this is the meaning of the Andreth prophecy.
Perhaps notable is that the prophecy is given to Andreth. My feeling is that Tolkien was going to retain some form of a final battle, but it was not to be characterized as a prophecy given by Mandos, and was rather to be imagined as a Mannish idea.
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