As noted, WWE announced Brad Maddox's departure today.
According to PWInsider, Maddox was released because of language he used during a pre-dark match promo at Tuesday's WWE TV tapings. As noted, Maddox lost to R-Truth and ripped the NFL's Indianapolis Colts before the match. The phrase "cocky pricks" is what got him in trouble.
WWE officials then made the decision to issue release Maddox, who had been with the company since 2010.