In line for something
Definition 1 of 2
Pro Tip 1/3Expectation of Reward
Used when someone might receive something due to their actions or situation. 
She's in line for some recognition after all her volunteer work.
Pro Tip 2/3Not Guaranteed
It indicates potential, not certainty, that you'll get something. 
He's in line for a bonus, but it's not confirmed yet.
Pro Tip 3/3Rank or Succession
Often related to a position obtained by rank or succession, like a royal title. 
The princess is next in line for the throne.