Remember how in Mk4 how she let Shinnok enter the realm? Isn't that what she's doing this time? Excpet it's the dragon king...

Her ending is probably gonna be the same one but a lil modified like:

Tanya leads the last survivor(s) ( I dunno who/whom ) to the Dragon King's lair and tells them that the Dragon King is defeated only to find out he's still alive and used Tanya's DECEPTION to lure them there.... and then they die..

But if it wuz up to me her ending should have her have a confrontation with the Queen ( Sindel ) she imprisoned and then Tanya kicks her @$$ and then takes the throne and be-heads Jade, and takes Mileena Princess ( since shes always wanted to be the princess )
Opposite would happen if Sindel won... she be-heads Tanya... or at least scream at her, and then have Kitana come bak and kick Mileena's @$$ and then boom! Edenia's normal....

But wouldn't be funny how in the end Kitana excepts Mileena as her " sister " and the two become friends and Kitana shares her Princess status?

*Hehe and then Jade gets mad and stabs a stick through both their heads haha *