Actually there was some hope given:No hope was ever given by NRS that I am aware of. The original petition was from some fans in Poland that realy wanted a pc version. Boon has basically said "Eff dat!" to the idea.
Boon says that the Mortal Kombat team may also follow in Street Fighter IV's footsteps and will think about releasing a version of the game for the PC.
"We're definitely considering it," Boon says. "I've thought 'How many fighting game players are PC guys?' Apparently there seems to be a market for that in Europe. Since we're on the Unreal Engine, I guess it's not that much of a change from the console versions." Those plans definitely sound like they're open to change, as publisher Warner Bros. has only announced Mortal Kombat for consoles.
source:
http://kotaku.com/5618460/mortal-kombats-post+launch-balancing-add+on-character--pc-plans
I've seen older petitions for older games, but as we see, there isn't any pc version newer than mk4. That is why I came with an idea for "anti-petition". I don't want to see words like those above anymore knowing that such game will not happen.
btw there was another petition, better written and with more signs: http://www.petitionspot.com/petitions/MK9onPC/