It’s entirely possible that this bit of social media activity was simply an expression of his fanhood for the series, or meant to spin the heads of some of his fans (particularly those who enjoyed the Carpenter-inspired The Guest) — but it was also readable as the director hinting about an upcoming project.
That is a Tweet from director Adam Wingard, and while it alone doesn’t mean anything, what is significant is the fact that A) he posted it the same day as the Blumhouse/Carpenter announcement, and B) it is one of a string of Tweets he posted about Halloween and/or Jason Blum that day.