I know none of these endings are cannon, but on MK9 they showed some things on the endings that have ended up appearing on MKX in a way or another (Scorpion killing Quan Chi, Sub-Zero and Scorpion "befriending" each other, Enenra taking over Smoke's body and many more).
I'm excited to see how many of those endings from MKX will appear on MK11 in a similar way. I'm voting for Johnny Cage and Kano as my favourites.
Jax is dead.
Shang is revived.
Dark Raiden wins Mortal Kombat and Invades out world.
Quan chi is a champion of the Elder God's.
Lu Kang and Kitana fight Raiden to invade earth realm.
Koto Kahn allies with Nether Realm and black dragons to repel Raiden.
Edinia will be invaded.
What I gathered from most of the endings..
Raiden prevents Hanzo's suicide and sentences him to 'Life,' employs him and his clan to Outworld, defeats Kotal, and claims dominion over the realm. Kotal pleas to the gods for a fortification to the realm; creating a new Outworld Mortal Kombat. Raiden would then challenge Kotal, but would find that Bo'Rai'Cho has taken sides with Outworld.
Meanwhile, Johnny asks Jax to lead his team while he is hospitalize, and Jax accepts. He would later be escorting the team to a ship, where Erron would jump from the Cargo Bay. Jax would successfully defend them, but succumbs to the bullet in his chest, which Johnny gets word of and tells Sonya about shortly after she woke from a nightmare.
Later, Kenshi would take Takeda to search for his mother's killer. They would stumble upon the Red Dragon Clan, and eventually Taven. The three would unite and later encounter Daegon, killing him and avenging Takeda's mother and Taven's parents.
Kung Jin meanwhile would venture to the depths of the Netherrealm where he would find Kung Lao. Able to reach out to him and return hope to Kung Lao, they would return to the Wu Shi Academy where Kung Lao would train to stave off the evil that has long held dominion over him. Kung Jin would finally have his cousin back.
Peering back on old visions he had seen long ago, Raiden dispatches Cassie to hunt down and kill the returned Shang Tsung. Aware of the threat Shujinko would unleash, Raiden couldn't afford to take risks and deceptively targeted Shujinko as the weakened sorcerer. She would be successful in her hunt, but become enraged and distrustful of Raiden thereon.
Lastly, back at Outworld, Ermac's power would be diminishing as the real sorcerer Shang Tsung had returned to life, absorbing all the souls Ermac has consumed; among them being Shao Kahn's...
That's really all I have.