Will there be an Avengers: Endgame trailer this Sunday? Possibly. Will fans find out the title of Episode IX and see new footage? There's a small chance.
One thing that is certain, is that their will be new Toy Story 4 footage shown during one of the commerical breaks during Sunday's Super Bowl airing. What will likely happen is that a truncated TV spot will air, while a longer, full-length trailer will be released online.
Check out the official announcemtn below. Toy Story 4 hits theates June 21, 2019.