I have reasons to be almost positive Walter kills Skyler.
Care to share?
Walt has a post-murder tendency to mimic certain behaviors of people he has killed. After he killed Krazy 8, Walt began cutting the crust off of his sandwiches, just as Krazy 8 had. When Mike and Walt met at a bar at one point, Walt ordered his drink neat while Mike had his on the rocks. After Mike dies, Hank gets Walt a drink at his office, and Walt asks for it on the rocks. At the open of season five when Walt is at the Denny's, he is driving a Volvo. A certain Chilean fast food chain owner used to drive a Volvo. At that same scene at Denny's Walt is ordering his birthday breakfast, arranging the bacon strips to show his age. Remember when Jr. would insist that Skyler do this on every one of Walt's birthday's, and she would?
I didn't come up with this, but I saw it somewhere a few months ago. I think it was on 4chan.
Now my guess of Jesse killing Hank is basically a shot in the dark, but remember the tension between Hank and Jesse sparking from the fake phone call about Marie's death to help Jesse and Walt escape the trailer? Later, Hank went to Jesse's and beat the shit out of him, but their was no real resolution between the two. Jesse recouped in the hospital while Hank moved along with the case. Now here we are in season 5. Jesse is essentially in the clear. He's wanted out of all the mess for a while now, but Walt is basically on the verge of getting busted. The whole premise of the show is the change in role of all the characters: Walt goes from responsible caring teacher to selfish crazed drug lord. Jesse goes from petty criminal yolo punk to a maturing, regretful, likable dude who just wants to get away. A recurring theme has been Walt dragging Jesse back down into the abyss Jesse is trying to get out of; Walt making him kill Gale, Walt dragging him back into cooking, etc. I feel like the ultimate way for Walt to fully be "Heisenberg" is to pressure Jesse to kill Hank and resolve the unfinished business, but it will obviously be because of Walt's selfishness.
Who knows, maybe Jesse kills Walt. I mean, he has a few reaons to: Mike, Brock, Jane etc.