Here's my bet. Walt's got two goals now -
1. Get Gray Matter to take over the job of supporting Skyler and the kids. They have every reason to, they've offered to do as much in the past, the Feds can't do anything about it, etc. They may hate Walt now, but they'll do it out of respect for who he used to be.
2. Todd and co. have got to go. Which is obviously going to put Walt and Jesse back together somehow as well. They're on the same team again with a common enemy, and now Jesse also has nothing left to lose (except for Brock, a potential wild card that may get played somehow.) Also the show's gone out of its way to make Todd and the gang completely awful, as opposed to previous villains like Gus, whose motivations and choices were at least understandable.
Both Jesse and Walt have been grievously wronged by the Bros, and have people they care about who are directly threatened by the Bros. They're certainly gonna try to burn that crew to the ground - although the way the show doesn't ever make things easy, I'm not gonna place any bets on whether they'll be fully successful, or what they may do to each other once that job is done. (Bonus, the DEA may end up being the cavalry in some way - hi, Marie!)
So I guess I spoke too soon when I said Walt's story was effectively over in the last episode - there does seem to be one last character turn to play out. Walt's finally accepted that he can't "fix" this, not in the way that he used to. Flynn made that clear. Instead, he's coming back to atone for all his sins by doing what's right - not what feeds his own ego or advances his legacy. He wants to die as ol' Walter White, rather than Heisenberg. The werewolf changing back to human form as he lays dying, you might say.
Or it'll be something else entirely. Hell, I dunno.