Whilst Huell and Patrick might not be showing up, there's been hints at appearances for some of Saul's other employees and paying customers. Bryan Cranston will definitely be around the set of Better Call Saul at some point, since he's directing a couple of episodes; whether an appearance as Walter White is possible, considering the timeline, is another thing. He's certainly expressed an interest in reprising the role (besides that Superbowl commercial, at least), but Dean Norris nixed any chance of Hank from appearing in the series thanks to his commitments to Under The Dome. Like anybody watches Under The Dome. Hank and Saul would definitely have had run-ins at some point... Apparently Anna Gunn has had talks with the producers about showing up as Skyler at some point, which should have certain sections of the audience up in arms seriously, who wouldn't freak out if their husband was a meth dealer and Aaron Paul appears to be up for anything. How else do you explain Need For Speed?
Tom Baker is the Comics Editor at WhatCulture! He's heard all the Doctor Who jokes, but not many about Randall and Hopkirk. He also blogs at http://communibearsilostate.wordpress.com/