Nix explained that Nate (Seth Peterson), who is the brother of Michael (Jeffrey Donovan), will have started to settle down.
"He has a kid now," Nix told TV Line. "It's just another thing Michael is dealing with."
Nix continued: "We really like having Seth around and part of this whole season is just dealing with who Michael is vis-a-vis his family and the people that he cares about. Nate is part of that."
Stars including Charisma Carpenter, James Frain, Gavin Rossdale and Matt Lauria have signed up for appearances in the new season.
Burn Notice continues on Thursdays at 9/8c on USA.