Let's go ahead and assume that yes, Jon Snow is definitely dead. If the Night's Watch doesn't burn his body in time, he could be resurrected as a wight. We don't know how White Walkers are created, but it's possible that he could become one of those. Only two episodes ago, we see the Night's King take an interest in Jon at Hardhome when his Valyrian steel sword shatters a White Walker. Legend has it that the Night's King is a Stark, and maybe he could sense the Stark blood in Jon, as well. After all, why would the writers show such an interesting interaction between the Night's King and Jon Snow just to have Jon die almost immediately? Will Jon somehow inherit the Night's King's post as leader of the White Walkers?
