I see that when you pre-order you get Goro, however on the PS4 store it says only if you pre-order the premium edition. I was under the impression that it was for the regular edition of the game as well. Is this not the case? The Xbox One digital version does seem to come with Goro.
Here's what it says on the PS4 store.
Pre-order Mortal Kombat X Premium Edition and access legendary fighter, Goro, as a bonus! Play on 4/14/15 starting midnight ET.
That is in the description of the regular $60 edition of the game.