In a small interview that was published close to two weeks ago, author Diana Gabaldon answered a question about how the Outlander series will end. Usually she says knows how it will end, that final scene in her mind already, but has not spilled much information other than that. We know Sam Heughan, Maril Davis, and Ronald D. Moore are privy to the details.
Here is what she cryptically said:
I think the Outlander books will end in about 1800 in Scotland. If this tells you anything, more power to you. The last book will have a happy ending, although I confidently expect it to leave the readers in floods of tears anyway.
I, for one, do not want to know until I am reading it for myself, and who knows which book (nine, ten, …?) will close the story of Jamie and Claire.
Source: The Press and Journal