Diana Gabaldon, author of Outlander, talked about her future plans for Claire and other characters from the novel in an interview with Zap2it.
Keep reading for the scoop --
On introducing Claire's childhood and parents:
You might. Learn more, I mean. But probably not for awhile.
On casting an older Claire should the series get renewed for season 2:
Assuming that we do get a second season, the answer would be no. Caitriona [Balfe] is 35 -- she can easily play Claire in her 40s, as well as she plays her in her late 20s. Besides, you'd never find anyone to play Claire who's as good as Cait is.
Gibaldon also gave out hints on whether the Scottish "ghost" is Jamie or Jamie as time traveler. She said:
He's a ghost. As to explanations ... last thing in the last book.