Maybe this is nothing, but on Twitter, I see the @HeyPlaystation account (its an official Playstation account) tweeting this
Maybe Sony has a choice to make between these franchises and this is Sony's way of asking the fans which character they would want to be in the game? I personally dont want any of them in, if I wanna play a fighting game with them, I'd go play their game.
I'd rather not have a rep from either series (neither is HUGE to the PlayStation brand), but I'd definitely have to say Scorpion from MK and Seigfried (or Nightmare) from SC. Those are both fan favorites and huge staples of both series.
I love both Mortal Kombat and Soul Calibur, but I'm a much bigger Soul Calibur fan so I would support Soul Calibur being in over Mortal Kombat lol
But as a rep, for Mortal Kombat, I know everyone's vote is for Scorpion, but I say Sub-Zero, just as iconic, and we already have a fire user in the name of Sweet Tooth and possibly Evil Cole. Now the only ice user would be Cole and that is only his LV 2 super. Sub-Zero would have a ice everywhere lol
And as for Soul Calibur rep, it's pretty obvious it should be either Siegfried or Nightmare. But my vote would be for Nightmare just because of his awesome design and potential moveset and to get another villain in the roster. I would be kind of disappointed if they used new to the roster Patroklos to "promote" Soul Calibur 5. It's not that he is a bad character, it's just, that Siegfried and Nightmare have been around the longest in every game, Patroklos is only the main character in the new game lol.