We know it doesn't end well because of the way the 5th season started with Walt in a car full of guns. Then the rest of the 8 episodes dealt before that.
Because of that scene, the only thing I feel comfortable predicting is that Walt will pull the trigger on that "vanishing act" new identity service that Saul offered him in season 3. In addition to the guns, he's changed his appearance, is in a totally different part of the country, and has fake ID with a different name. Somehow, he's going to figure out that Hank has found him out and he'll get the hell out of Dodge before he can be taken in.