Jason Voorhees was the first additional fighter announced for Mortal Kombat X. The slasher favorite will certainly feel right at home in the gory world NetherRealm have populated.
According to a Kombat Kast yesterday run by the developer, he will be making his way into the game in on May 5th. On top of that, the dev did said that they will be doing another stream to show off the character on May 4th.
There is still no word on when to expect Predator yet, but owners of the Kombat Pack DLC will get the characters when they become available. You'll still be able to buy Jason separately, but not until a week later. No price has been announced yet.
Thanks for the heads up IGN.