I think Walt's fake death (kind of thinking this with the comment to Hank about his cancer coming back) will put his family at ease with tons of $ if she can launder it enough with the car wash and even more if they purchase them. His wife knows about Walt but beyond that, she is clean and gets to keep the $. I'm thinking Walt has a crappy car on the first scene because he is off of the grid and his family has all the $. I'm wondering if the ricin is for Jesse as he may be "talking" and may be trying to give up his family for immunity after Walt's fake death.
Lidia, I think is done next episode and I think its her contacts overseas that take her out. The moving parts are coming apart, she said. The next show is titled "Bearing". I'm guessing this is mostly referencing all of the moving parts and them coming apart.
I don't think Walt takes out Hank, that would be just too much stress on his family. His best choice is for him to leave, i.e., fake his death. While he isn't there for Jr, it gives them the opportunity to have the $$$, which is why he started cooking in the first place. The end goal is the same, the journey is likely way different than he expected.