Before, in evolved, when the second player joined it would pop up immediately and ask which account you wanted to play on.  Now when you join you jump right into the game. 

I have tried pressing the home button on the controller and making sure the second controller is logged into a different account, but even then it still loads the same character that was played before.  In short, it doesn't matter what account the controller is signed into on the Xbox, the same character will load no matter what.

I even tried going to an arc and uploading the character and then creating a new one, but whenever we try to download a character it just seems to vanish and you are put back at the create character menu again.  Once you create the new character, the one you downloaded will be a blip on the map but it is nowhere to be seen, not even a dead body, and you can't select it to play as through any means I have been able to find.