If you don't remember, Wonder Woman's love interest, Steve, apparently died in the first film.
Star Gal Gadot also shared a still from the film, which showed her character looking at a group of screens.
Pine's return to the series means that he will appear alongside the sequel's villain, Cheetah, played by Kristen Wiig.
SHARE THIS STORY USING ANY OF THE BUTTON BELOW ⬇ PLACE YOUR TEXT ADVERT BELOW ⬇⬇⬇So excited to confirm the most thrilling news. Yes! It’s true! So incredibly lucky to welcome the sensationally talented Kristen Wiig to our Wonder Woman family. Can't wait to finally work with one of my favorites. And SO excited by what we have planned. #Cheetah!!! @GalGadot pic.twitter.com/Gn0jICiIAH— Patty Jenkins (@PattyJenks) March 9, 2018