Stream Horizons: A Carousel of Progress on Disney Plus on Saturday, August 15 at 10 0m ET, and discover all the new announcements from Disney Parks! What do you think will be announced at the Disney D23 expo in California this year? There’s a great big, beautiful horizon shining at the end of every day… specifically, Saturday, Aug. 15. Whether you’re attending in person or following along from home, there’s one thing you’ll want to add to your D23: The Ultimate Disney Fan Eve