Unlockable Voice OversAdded 29 Jul 2013, ID #18018
It is possible to unlock a whole ream of additional voice overs to be heard during the game's menus, and during play as the announcer.
To get these, simply finish the game's story mode with any character, and on any difficulty. This will net you that character's voice. You only get the first character's voice that you choose for the team on that playthrough, so bear that in mind when trying to unlock these.