User blog comment:CureHibiki/Pretty Cure Plus & Minus Round Titles!!!/@comment-37117761-20191120192545

My guesses:

Round 1 will have Cure Magical in it, as well as Cure Black or Cure White.

Round 2 will have at least one character from Star☆Twinkle and Cure Melody. Maybe Cure Honey will be there as well.

Round 3 will have Cure Parfait and Cure Cosmo.

Round 4 will have Cure Marine and Cure Yell.

Round 5 will have Cure Passion, Cure March, and Cure Twinkle because they were the top three Cures last year.

Round 6 will have the least popular Cures - Milky Rose, Cure Heart, Cure Ace, Cure Miracle, Cure Whip, and Cure Star.