From German Gamepro magazine:

"Not only have we seen the MK series grow up, but we will see some well-known aging heroes. In conversation, Ed Boon told us that there will actually be several versions of Johnny Cage, Sonya Blade, and Liu Kang. Liu Kang?" (Something here like "but sure," "safe bet," IDK.) "Make no mistake about it: although the Shaolin monk has not been announced, the poster-boy of Mortal Kombat will certainly be playable."

"The aged heroes, according to Boon, will differ not only in appearance from their younger versions, but will also play differently, and will master moves" (something here like "used in the other incarnations").


This makes it sound like some of the human characters, like Sonya, would get different variations based on their age.

Now this screenshot from the Story trailer, shows a character laying on the floor, which many people have speculated that it may be Sonya (vest, boots, blonde hair, ponytail, fingerless gloves). That scene takes place during Shinnok's invasion, which would be only a shot period of time after the events of MK9, and would be Sonya's youngest variation:
Clicky

Now this recently leaked screenshot from the story mode, shows an aged Sonya (that still doesn't look too old) wearing the costume she's wearing in the comics, which takes place 15 years after MK9:
Clicky

FInally, this screenshot from the Generations trailer, shows Sonya's portrait from the factions mode, she looks the oldest here, and is wearing a beret instead of the cap she wears in the comic, i think this may be the oldest variation, and that she may had been promoted within the special forces:



But this is only speculation, what do you think?