The Breaking Bad creator spoke about the spinoff with co-writer and producer Peter Gould at the Television Critics Association tour on Friday.
Bob Odenkirk stars as the eponymous Saul, although the character will be known by his given name, Jimmy McGill, on the program. Other series regulars include Jonathan Banks as private investigator Mike Erhmantraut, Michael McKean as Saul's brother Chuck, Rhea Seehorn as Kim, Patrick Fabian as Hamlin and Michael Mando as Nacho.
The series is set in 2002, six years before Saul met Walter White (Bryan Cranston) in Breaking Bad. Gilligan said "it is indeed a period piece," and confirmed the show features "non-linear storytelling" that jumps "around in time." White may be written in "if it makes sense" and they find the right "way to do it," and Gus Fring (Giancarlo Esposito) might also return.
"These are all characters we love and with Gus there is so much more to say about that character," Gould shared. "Having said that, we're trying to make something that stands on its own, that has an entertainment value that's not just seeing a series of old favorites... So we try to balance these things out."
Better Call Saul premieres on AMC in 2015.