As was previously reported, Michael McKean will play Chuck, Rhea Seehorn will play Kim, Patrick Fabian will play Hamlin and Michael Mando will play Nacho - all characters that will represent both legitimate and illegitimate sides of the law.
The duo were mum about other character descriptions, although in regards to Seehorn's character and the inevitable comparisons to Anna Gunn's Skyler White, Gilligan said he "will never write less-than-perfect women again."
"Rhea, she is just as cute as she can be and just a wonderful funny actress and capable a great deal of depth," Gilligan added.
AMC also released two new photos, shown here, and noted in the press release that the show is a prequel -- possibly putting aside speculation about the show's flexible timeline.
"It is period," said Gilligan, stating it takes place in 2002 and adding that "we tried hard on 'Breaking Bad' to try not to be too specific where it is."
Still, he later teased, "you saw on 'Breaking Bad' that we like nonlinear storytelling."
As previously announced, "Breaking Bad's" Gilligan directed the first episode of the series, which has already been greenlit for a second season of 13 episodes.
The debut season, which will consist of 10 episodes, will premiere in 2015 -- later than expected, for which Gilligan says he takes responsibility.
"We have a way of doing things that is slower than most TV shows," Gilligan says. "We want to think everything through and we feel that that pays dividends."
"Better Call Saul" is executive produced by Gilligan, Gould, Mark Johnson and Melissa Bernstein with "Breaking Bad" alums Thomas Schnauz and Stewart A. Lyons as co-executive producers for Sony Pictures Television.