devtrackers.gg
That’ll be their next game, R6 is probably code for the 6th game Respawn develops after Titanfall, Titanfall 2, Titanfall: Assault, Apex Legends and Jedi: Fallen Order. Apparently they’re working on a Medal of Honor game for the Oculus though, and this could represent a character from that game as it looks like WW2 era clothing.
This is almost right. R3 was the game the Star Wars team was working on before Star Wars, R4 is Star Wars, and R5 is Apex.