If it is not Kane then i would be very surprised. If you look closely in the mirror it looks like him, plus there is the mask and his glove.
Come back Kane , Come back , We miss you very very much , please come back , let the era of Big Red Machine's terror begin
I think out of all the build ups in story lines, over the years in the WWe, when those ring posts ignited, it all went red, the look on the Undertakers face, the creepy music et al, was one of the top defining exciting moments in wrestling history, ever.
You clearly have not been watching it. There was another video which says its him and its been all over the WWE that he is coming back!!