Which is sad, because that's one of the two couples I wanted a 'Happy Ending' for ...
"The Constant" and Desmond reuniting with Penny should have been the end of their arc. If she's dead that would really shit on one of the best eps of the series.
It would be a nice surprise if they gave them a happy ending. Can't say I cared much for Desmond until they developed his relationship with Penny.