In season 1, Walt kills Krazy 8. As we know, Walt always cut the crusts of his sandwiches as Krazy 8 didn't like the crusts, After Walt kills Krazy 8, we see Walt make his own sandwiches a lot and we always see him cutting of the crusts even though he never used to do this as he didn't mind eating the crusts. Now later on in the show after Walt kills Gus, we see him act like Gus, always taking control of every situation, his say is the only one that matters and making sure he's one step ahead. As well as this after Walt kills Mike, we see that he starts to drink Mike's special drink. Incase you haven't spotted the pattern yet, after Walt kills someone, he starts to act like them! (Cutting the crusts, acting like he's Gus and drinking the same drink as Mike). Now who always cuts Walt's bacon up into his age on his birthday? Skyler did... DUM DUM DUUM.
This is why I believe that Walt will kill Skyler due to the hidden message that whoever Walt kills, he acts like them. Now you may be wondering what about Jesse? When does he act like Jesse in a flash forward that we've seen? Well recently 17 new photos have been released for the new season. In these images we see that Jesse has a full beard now. Now rewind again and in that flash forward at the beginning of season 5, we see that Walt's beard looks almost identical to the beard that Jesse's grown. That means Walt's started to behave like Jesse in terms of the beard being the same. (Walt always has his goatee beard). Also in season 5 episode 3 Mike says to Walt and I quote "Just because you shot Jesse James, don't make you Jesse James" JESSE! They could of picked any famous bad person like Al Capone or even Pablo Escobar but they choose someone called Jesse. With the hidden messages they use in Breaking Bad, they wouldn't just pick that name randomly. Anyway that's my view on why I think Walter White kill Jesse and Skyler. What do you think? Leave your comments and please feel free to leave your views on what you think may happen.