They are Super Saiyan Blue (SSB) Goku, Super Saiyan Blue (SSB) Vegeta, and Android 16.
If true, this brings the total roster count of characters to 13 – Goku, Vegeta, Teen Gohan, Frieza, Cell, Majin Buu, Krillin, Piccolo, Future Trunks, SSB Goku, SSB Vegeta, Android 16, and Android 18.
It’s assumed both SSB Goku and SSB Vegeta are separate characters from normal Goku and Vegeta.
Dragon Ball FighterZ will have a story mode revolving around Android 16, who has somehow been revived.