I think Walt Sr. is going to keep evolving into more and more of a ruthless killer and eventually become a drug kingpin himself, like Gus.
He deserves another grammy though for real, his acting has been topnotch, especially last night. In that scene when he was led to the lab and realized they were going to execute him, he really had me believing he was about to give up jesse and do anything to save his own life. That whole episode was done extremely well. Mike The Cleaner was badass too.