https://www.cnet.com/news/stranger-things-seems-to-be-teasing-an-imminent-trailer-with-rats/

They've been hinted at before -- the season 3 poster, released on New Year's Eve, definitely shows some rats at the bottom of the picture.

One Twitter user hoped this means a new trailer is coming on... World Rat Day, which as we all know is April 4. (Just kidding, we never heard of it before.)