DEA...D? I know Walt isn't going to put a hit on Jesse, I absolutely believe that as greedy as he is for his personal self-gain, that he does care about Pinkman. Maybe Hank might go in too deep and endanger Marie's life? She is holding the mug after all.
Looking back at the chair and jail cell resemblance, maybe somehow, if Marie does end up dead (maybe by Todd's uncle), Walt will find a way to frame Hank...? & Marie researching poison methods for 6 hours... Who's she going to poison? Skyler? Holly? Marie is the last person you'd guess to have gone dark, so Gilligan is just getting started setting up a surprise with her.
Speaking of Holly, @chief, I do think the pink bear has something to do with her future.
This bear was seen in several episodes of season 2, there's no way that the significance of this bear could just mean the responsibility of Jane's dad and the airplane crash. Jane's dad wasn't even an important role in the show. Plus, Walt still has the bear's eye... Wonder what that means.
I also saw this theory that really blew my mind. The last episode's titled "Felina."
Fe-Li-Na = Iron-Lithium-Sodium = Blood-Meth-Tears.
This is a song called El Paso. Coincidentally enough that El Paso was a place of interest a couple seasons back. If you check out the lyrics, FELINA (same name as the title of the last episode) is the woman that the narrator dies for. Walt's M60, could this be the weapon he's going to be using during the final battle in El Paso? Who will Walt be fighting for, what will he be fighting for? Blood, meth, and tears is on point. Oh shit, and also, Felina is an analogy for "Finale." Crazy shit man, Gilligan is a genius. This song would also compliment the ending of the show. I can picture it already.