There's definitely some sort of drum pads being used on Wretches and Kings.
There's a pedal being used for Brad's 'solo' on Waiting for the End. (Most likely a Digitech whammy again.)
As far as Mike's vocal effect on Fallout, there's a vocoder being used. He is either playing each of the "voices" directly through a keyboard or he has some sort of octave effect along with the vocoder itself.
A vocoder is used to alter your voice and is popular in the group Daft Punk. It's mainly used to make you sound robotic but it has been used for other means. The way it works is you have two inputs for the vocoder, the vocoder effect being the output. One input is the device you are using to play the individual notes, and the other input is the sound that you wish to manipulate, Mike's voice in this case.
Ex:
Input 1 = Mike's Voice
Input 2 = Keyboard
Output = Vocoder
As far as the vocal effects used on The Catalyst, it sounds like a phaser. Rob Zombie has used a strange phaser effect during live performances that sounds similar to what could be pulled off on that song.
Joe's gear looks pretty normal to me except now he has a more compact set of samplers, a Korg Kaossilator, and whatever that Lemur device is. It looks like something video related but I can't be too sure. It's possibly something to do with the visuals they had behind them.