I thought this partial-season finale was another stellar episode. The two musical montages (the prison killings and the cook with international shipping) were both typically great, and as much as it was kind of a relief to hear Walt say "I'm done," I loved the cliffhanger that ended the episode. It was unusual having Hank audibly flash back to his prior discussion with Walt about the Walt Whitman passage, but I guess that was necessary for more casual viewers to make it clear why this was a cliffhanger. I think we can safely assume that some combination of the DEA, the Chileans, the Mexican cartel, Declan, Lydia/Madrigal/the Czechs, cancer and perhaps even Todd's uncle and/or others will be converging on Walt next year.
I hope (and fully expect) that Gilligan will bring this show to a suitably grand conclusion.