presumptive vs soon-to-be

presumptive

adj
  • Based on presumption, probability, conjecture, hypothesis or belief. 

  • Making presumptions; behaving as one who presumes, who assumes that which they perhaps should not. 

soon-to-be

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

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