Date release : 

The anime Sword Art Online is coming back on July 11th  2020 with the second part of the arc alicization war of underworld. It was announced on the official website. 

Trailer :

The announcement of this return came with a trailer, and pretty cool one who spoils nothing and hype the public.

Despite a season 4 who has take time to set up and has disappointed viewers , the second part must be awesome and rich in revelations. Moreover, the animation seems to be improved.

Synopsis :

For those who don't know about SAO, let's done a little recap. The story is about a young man who likes video games. One day, a new VR MMORPG has been released. But, after few hours he realizes than he can't disconnect. He is stuck in the game. If he and the other players want to get out of this game, they need to finish it. Easy ? No because if they die in the game, they would die in the real world.