DISH Network is a leader in many things, so yes, DISH is on the cutting edge of technology. But that isn't what "CE" is about. "CE" is a DirecTV program where users voluntarily and intentionally force each download of pre-release software for testing. DISH does not have such a voluntary program in place. DISH normally tests via registered beta testers who sign non-disclosure agreements and report directly to DISH confidentially.
Some people like to humorously call themselves "beta testers" if they are "lucky" enough to be among the first customers to receive a DISH software release but there is a program in place for pre-testing software. It just is not an open process like DirecTV's "CE" program.