The scene with Hank's boss talking about how it was like Gus was two different people, then the look on Hank's face as he said that...I think that was some foreshadowing of some events that will eventually unfold between Hank and Walt.
I also didn't go into this season with any idea that Walt and Jessie would start cooking again, especially so soon lol. It's pretty fascinating how they've showed Walt's descent from mild-mannered husband and father, then into somewhat of an anti-hero, and now has essentially turned into a diabolical egomaniac. Hence why he wants to cook again.