According to a posting from the Dillinger Escape Plan, guitarist Brian Benoit is:

…out of commision right now with an arm injury, leaving him unable to play on this current tour, so our buddy James is filling in for him for the next few weeks, until after Brian gets surgery and has had time to recover.

The band is currently on tour with Every Time I Die, Zao and Misery Signals and is headed to Europe for the month of November.