Disney CEO Bob Iger debuted the first STAR WARS: THE LAST JEDI footage (a.k.a. a sizzle reel) at their investor's conference and the website SlashFilm was also in attendance. The site has a description of the footage seen on their site, however, I personally do not want to read it or know about any of it. So I'm going to provide you with a link below to click and read it... if you dare.
Toy Fair 2017: Hasbro Reveals Star Wars 40th Anniversary 6-Inch Figures on Backer Cards
Press Release: STAR WARS Force Friday II Set For September 1, 2017
STAR WARS: THE LAST JEDI Opening Crawl Teaser Image Shared