@Nikosaurus - I was just saying that particfular tweet wasn't a confirmation of anything. It reminded me of when JV was asked if there would be anymore characters than what had been seen in the Hall of Heroes and he responded "How do you know you've found everything?" and some people started shouting this was confirmation of more characters coming and got everyone's hopes up. I don't want to see that again.
Of course, if MightyGitis says there are definitely more coming based on what he/she saw in Avalanche studios, that's awesome. Hopefully it's something cool.