The acclaimed AMC series concluded last year, with series lead Walter White (Cranston) apparently having bled to death following a shooting at a meth lab. The ending was generally well-liked, although pockets of fandom were upset -- either because he had died or because his death seemed too "easy" and that he wasn't punished for his actions throughout the life of the series.
Cranston, though, told CNN, "Hey, you never saw bags zip up or anything. Or say ... you know."
Asked whether there is a chance for more down the road, he said "Never say never."
More likely than more Breaking Bad, AMC could find some contrivance to put Cranston's character in the upcoming prequel Better Call Saul. Cranston and his co-star Aaron Paul have already expressed interest in making brief appearances in that series, which stars Bob Odenkirk as a smarmy lawyer whose life was eventually sucked into White's orbit on Breaking Bad.