https://www.pcgamer.com/battlefield-5-trailer-briefly-teases-the-battle-royale-mode/

A new Battlefield 5 trailer has been released ahead of Gamescom, and while its footage may have been captured in-game as the trailer claims, having played the alpha I can tell you that BF5 matches are not perfectly choreographed in time with music. That technology hasn't quite been mastered yet I don't think, though it is a very pretty game, as you can see above.

Stick around to the end of the trailer for what appears to be a very brief tease of Battlefield Royale, which is what we assume the battle royale mode announced at E3 is called, though that might change. It looks like the 'circle'—like PUBG's blue barrier that shrinks the play space until only one player is left—is a ring of fire. It seems that a bunch of soldiers somehow fell into this burning ring of fire, and as the match progresses its radius goes down, down, down, while the flames go higher, and it burns, burns, burns (the ring of fire).