In the debut story we saw 5 of them; Serafina, Fuego, Perro, Aguya and Sangre
The second group, we a bit later, under leadership of Cadena, which then included Corregidora, Martillo, Olvido, Luz and Piedra Dura.
Recently Diamante and Madre were revealed as members as well (they were boring though)
This shows at least Serafina, Perro and Fuego of the first group will return, as well as Cadena and Martillo from the second group.
I really hope for Olvido, Luz and Piedra Dura to return as well, as I liked the way they acted and looked.