Katherine Heigl is about to gain movie immortality, according to The Hollywood Reporter{
Dorian Gray got his shot at everlasting life through a painting that aged instead of him, but Adaline's longevity is apparently the result of an accident that renders her ageless at the start of the 20th century. She lives a solitary life until she meets that certain someone, who may be worth going mortal for. Like Superman when he gave up everything for Lois Lane. Except without the ice fortress, or Terence Stamp in leather trews. As far as we know.
There's not much to be learned about the details so far. "Accident that causes immortality" sounds like that sort of vague, Benjamin Button style magic-realism that doesn't need explanation, but the idea that Adaline can choose to go mortal for the right man suggests that this is more like a fairytale, where the spell has rules. The writers are Mills Goodloe and Sal Paskowitz, and it seems like a change of direction for both of them: Goodloe was involved with the Lethal Weapon series (and Assassins and Maverick - friends with Richard Donner then), and Paskowitz, if it's the same guy, has a background in surfing and skateboarding.
Sidney Kimmel, Steve Golin and Alex Madison are producing for Lakeshore, which is a similar set-up to both One For the Money (also starring Heigl) and The Lincoln Lawyer. Shooting is expected to start in October.