Samsung will be returning to flat screens for the Galaxy S21 series, according to Ice universe. The 2.5D glass of the Galaxy S20 and Galaxy S20 Plus will be replaced by 2D glass, but the S21 Ultra will have a curved display.
https://www.notebookcheck.net/Samsung-will-return-to-flat-screens-for-the-Galaxy-S21-series-Galaxy-S21-Ultra-to-retain-pronounced-curvature-though.498868.0.html
No sign of the jack since the rumor back in summer, not good.