The 33-year-old threw for 28 touchdowns last season but his side missed the playoffs with an 8-8 record.
"I don't want to get into all the details of it," Romo recently told FOXSportsSouthwest.com. "But I really think it can be a positive change.
"I really am excited about it. It's going to be a great thing."
Dallas open their regular season campaign against the New York Giants on Sunday.