Unfortunately, the beta version of the game has reduced this aspect ratio to the sharper (though still quite wide) 19:9.
Some gamers can probably handle it, some prefer it, but other online gamers will definitely cause problems when watching from 16:9 screens. So the 19:9 compromise is pretty fair, and those using it on ultra-wide screens will see slight black bars on either side of their game. “We will continue to monitor these discussions and explore possible solutions that do not change the way the game is played,” the studio said.