I'm kind of hoping that we learn more about Jack and his gang in the next couple of episodes in flashback form, like when he learned about Gus, the Salamancas and other supporting characters. I mean, yeah, they're neo-Nazi murderers, but I'd still like to know more about their history if they are going to be the main antagonists of the last season. I'd also like to see some of the killed-off characters in flashback form one more time before the show ends, Gus, Mike, Gale, Jane, and Hank for that matter. Maybe show them interacting with new characters like Lydia and Jack to tie everything up in a nice bow, showing that they were part of the story all along. And since the last episodes are going to be extra-long, there's no reason not to.
But even if they don't do all those things, I've decided that I'm going to like the finale no matter what. Vince Gilligan, the writers and the writers are all pleased with it, so even though I'd like to see Walt standing on top of a pile of bodies of all those who crossed him, I'll be satisfied with whatever ending they felt was appropriate for the story.