in the wind vs soon-to-be

in the wind

adj
  • Impending or in the offing; imminent. 

  • At whereabouts unknown, especially when law enforcement authorities have lost track of one's location. 

soon-to-be

adj
  • Planned or destined to have a specified position or quality in the near future. 

How often have the words in the wind and soon-to-be occurred in a corpus of books? (source: Google Ngram Viewer )