Can't remember/too lazy to find the earlier post, but I agree with them that its possibly just a tribute to the classic head to head trash talk of beheading your opponent, then popping off with a "Who's Next!?". Especially feel that way considering the spinal cord being there in the background, its just screaming in reference to a Fatality.
As for my opinion of the cast and story, heres what I'd absolutely love to see, as a fan of MK since day 1:
For the Story mode, pick up exactly where MK9 left off, and allow it to continue along with characters being killed off, returning or staying dead, and new (i.e 3d characters) ones introduced to the reboots story. It was by far a thrill to play through the mode several times, and still to this day I can go over to YouTube and get lost in watching every cut scene over and over again. Great Story, I wish to see it continue.
As for playable characters, bring em all back. If they are dead, and do not return in the Story mode, just keep em in their traditional outfits or whatever, and we'll go from there. If they happen to come back in the Story mode, then of course we will have a new look for them (zombie, undead, whatever), and possibly go back to the traditional look (MK9 or earlier) for alternate costumes.
This way the Story can continue as its going now, with Sindel having a huge K/D/A count and people being dead, yet allowing us fans of the series/tournament players the chance to play everyone, regardless of if they happen to be alive in the current story or not. The only thing i'd hate to see though, is having all of these great characters, but then having some of them feel a bit flat. Thats just me though, i'm sure it won't be an issue =P