We all know that Stranger Things season 5 will center around Will Byers. Some people have speculated regarding the possibility of the character acquiring superpowers in this season. However, hints from the latest Stranger Things Play indicate that Will Byers may already possess secret powers.
Warning: Major spoilers ahead for Stranger Things: The First Shadow
Also in the play, Henry Creel tells Patty Newby that he prefers spending time in the attic because "he likes it cold". It echoes Will Byers' remark in season 2 when he told Joyce that he likes it cold.
Earlier the Duffer Brothers said that season 5 is inspired by season 2 and the new insights from Stranger Things Play have made it clear. So if you want to get clues for the season finale, make sure to rewatch the second season.