As much as I love Breaking Bad, I have my doubts that this can be good. Saul works to provide levity, especially after Walter's turn became more evident, I don't know that a whole series based on a guy providing levity is a good concept.
Sounds like they're doing a prequel (or say they're doing a prequel) because Saul will be killed off of BB. Would be interesting/bummer watching a show where you know your lead eventually goes to an early grave. Then again, Huell sure is funny.