WWC in Puerto Rico aired an angle today to build towards an Alberto Del Rio vs. Ray Gonzalez match. The storyline is that Del Rio is looking to get back at Gonzalez for attacking Ricardo Rodriguez. Gonzalez is looking for revenge on Del Rio because of the attack on his son (see video below). The angle was shot before Del Rio signed his deal with WWE.
WWE has confirmed that Del Rio will be working on the next major WWC show. I presume WWE is ok with him working on the show because they have a working relationship with WWC owner Carlos Colon. Colon is the father of Carlito Colon and Eddie Colon (Diego of Los Matadores). He is also the uncle of Orlando Colon (Fernando of Los Matadores).