Right now, there are 4 people that know where Walt’s money is buried.
Given that he uses a bucket load of (presumably) that money to finance a new ID and an M-60, I assume that Hank and Gomez don’t make it out of the desert. If they do, they’re in a coma or somesuch.
I don’t think Jesse dies from the shootout. I think he gets kidnapped and forced to cook by Jack & Co.
Marie leaks the truth about Walt to the media, Skylar and the kids go into hiding (at Walt’s expense through Saul’s contact), Walt disappears separately - gets new ID and gun - and goes to final shootout with Jack & Co. - whether to rescue Jesse or finish the job I can’t decide.
The ricin is for himself - so the cancer doesn’t drag him through the gutter before it kills him.
he won’t use the ricin on himself, it’s too long. it’s not cyanide.
some good guesses and story lines
I think that Jesse cranks up Walt's Chrysler 300C SRT8 (the ignition key warning was sounding when Walt got out) backs up to shield the car behind Hank's SUV, picks up Hank and Gomie and hightails it out of there.
This leaves Walt the captive of the redneck cartel. I think Walt has them dig up his money and take it back to the lab compound. He calls Saul and has Skyler, Junior and Holly whisked off to new identities somewhere, probably New Hampshire because in episode 1 of this season Walt had a NH driver license and a Volvo with NH license plates.
At this point Walt is the indentured servant of the redneck cartel. I think they give him a furlough to see his family at some point. As he comes back he picks of the M60 and the ricin to extricate himself from his indentured servitude position.