eventual vs soon-to-be

eventual

adj
  • Finally resulting or occurring (after a period of time); inevitable. 

  • Possible, potential. 

  • Pertaining to events; event-related, evential. 

soon-to-be

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

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