SPOILERS
They showed walt getting cancer treatment, so if he was only 6 months from dying then why would he still bother if it wasn't a chance he could survive.. Also we see at the start that all his hair has grown back, so he must be healthy i'd imagine.
Found myself wanting to fast forward to see what happens next, was on edge big time watching. For some reason I am on walts side, I get where his heart was. The end bit with him threatening hank was Heisenberg at his arrogant best.. loved it