[woodbutcher1963]

Either that or Hank’s partner(I can not remember his name-CRS kicking in) gets killed.

However, based on the phone call Hank made to Marie. I think you might be right.

Maybe in the end(based on prequels) Walt is coming back to kill Todd, his uncle and associates.

The other thing I still wonder about is that in the first episode of this season when Walt was buying the machine gun he was driving a Volvo with the NH “Live Free or Die” license plates. When he showed up at his house to retrieve the ricin, he was driving a different car. I wonder if they will show when he switched or if it was a mistake.

[Semper911]

At the breakfast diner, the gunseller guy brings the other car with the machine gun in the trunk. He passed the keys to Walt in the bathroom. Walt switched from the NH Volvo and into the other car, evidently leaving the Volvo at the diner.

[E. Pluribus Unum]

The other thing I still wonder about is that in the first episode of this 'season when Walt was buying the machine gun he was driving a Volvo with the NH “Live Free or Die” license plates. When he showed up at his house to retrieve the ricin, he was driving a different car. I wonder if they will show when he switched or if it was a mistake.

I think you missed the fact that the Cadillac with the M60 machine gun in the trunk was part of the deal. Walt abandoned the Volvo in the Denny's parking lot and left with the Caddy. He pulls up in front of his condemned house in the Caddy to retrieve the ricin.