I think the most underrated part of last night is that family is now in play:
1. Walter, Jr. will be overreacting out of legitimate sympathy
2. Hank and Marie know that Walt is willing to reach out against family now.
3. The whole Walt vs. Jesse thing
4. Nobody anywhere has mentioned this (that I've found yet), but Todd kept calling him Mr. White instead of Heisenberg. I don't know if those guys knew who he was before, but they do now. They're willing to do some killing.
I was wondering about that too. When Lydia visited Walt at the car wash a couple of episodes, I thought it was odd that she knew how to find Walter White (as opposed to Heisenberg) too. I think Walt got a little sloppy in this area.