Published on Pottermore, JK Rowling’s Harry Potter website, the images show a young boy in a nest with wings.
The play, split over two parts, is designed to be seen either on the same night, or over consecutive evenings.
Producers have announced it is going to be a sequel to Rowling’s books, with focusing on Harry’s son Albus Severus.
“While Harry grapples with a past that refuses to stay where it belongs, his youngest son Albus must struggle with the weight of a family legacy he never wanted,” a synopsis reads.
“As past and present fuse ominously, both father and son learn the uncomfortable truth: sometimes, darkness comes from unexpected places.”
Previews will start in June 2016, at the Palace Theatre in London.
Early performances will have some cheap tickets on sale for just £10 per part, rising to £15 for the official run.