Kristin Dos Santos column yesterday contained a very light SPN spoiler. Her comments to a fan’s question for information:

"Did you ever wish you could date Sam and Dean?! Well apparently some lucky woman has, because we're going to meet a woman in her late 30s who is an old flame of both of them.

And as per SpoilerTV, that flame is named Annie and will be in episode 7.19 â€œOf Grave Importance." 

Just as a side note, that is slated to be Cass's last episode for the season, AFAWK!