Sorry, Psyga, but the last frame screams “WE CAN BE LIKE SISTERS AND SHARE THE SAME BATHROOM!”

Back slide.

@Background Pony #C7C2  
Except for the “totally redeemed” part.

@Background Pony #A3AC  
Rereading these comments, they’re actually a bit prophetic of what probably would have happened if Starlight hadn’t helps out with the act.

AS THE PROPHECY FORETOLD

Trixie confirmed

@Famekki
 
Well, I wouldn’t want to have her standing near the edge of a cliff, or there being the silhouette of a noose or anything like that. Just two scenes.
 
One in the way of Starlight begging Trixie to stay in Ponyville and Trixie looking sad, head bowed and saying something along the lines of “I’m done. I’m going now and I don’t expect I will return. (Hugs Starlight) “Thanks for trying to save me” then she leaves.
 
Then a second scene with the Mane Six desperately searching for her to no avail and Twilight freaking out, then Starlight offering the advice that perhaps they respect Trixie’s wishes and just let it go.
 
Then perhaps after the Mane 6 have left a final shot of Trixie standing on a moonlit hilltop before she turns away and disappears.

@Famekki  
He said disappear, not commit suicide.

@Background Pony #A3AC  
That can’t happen. Suicide, even implied one would be too extreme for a kid’s show.

There are two explainations for this:
 

Y’know, if it is indeed Trixie , I kind of want all of Ponyville + the Mane 6 to treat her like shit and make it clear that she is in no way welcome . Starlight genuinely identifies with Trixie and attempts to raise her spirits and make it clear she should have a second chance.
 
Starlight would even make the case that they forgave her despite her crimes were much more severe. But then Twilight accidentally let’s it slip that unlike Starlight she considers Trixie a weak loser and therefore not worth their time.
 
In the end Trixie is too damaged by everything that has happened and how ponies see her and decides to do the world a favor and disappear forever. The Mane 6 realize the error of their ways and try to find her to make it up to her. But Trixie would be gone for good.
 
The message of the episode: The more you treat someone like trash the more likely they are to believe it and sometimes there are no fixing your mistakes.

@Background Pony #1D38  
Sunset’s stuck in EQG pal. IP stuff and all.

@Red Cedar  
Yeah, it was more of a “Thanks for not holding me accountable for my actions bye” apology than anything.
 
And, I’m guessing Trixie over Sunset, simply because the logistics of bringing her back from the human world would be too complicated for 30 minutes, and if/when it happened it would concern Celestia/Twilight, not Twilight/Starlight.

If it turns out that Trixie is the focus of this episode, keep in mind one thing. In Magic Duel, Trixie apologized to Twilight, but not to any other pony who she had more time to do more and more horrible things to. I could certainly imagine some of the other ponies holding a grudge.

my Theory:
 
the pony actually is SUNSET SHIMMER. but why Twilight prevents friendship? because she’s scared. the power of Starlight and Sunset combined could rival any single alicorn.
 
and worse yet, Starlight and Sunset are very good at manipulating the masses so they, if they were so inclined, could start an actual revolution that would turn Equestria on its head.
 
a former top-of-the-class, super-elite protege of Celestia and a powerful self-taught magical prodigy is a combo you don’t just ignore.

@MLPFan2012  
Because that’s way too minor, and we as an audience would have no reason not to take Twilight’s side, because she hasn’t made up for her antagonism.

Everyone keeps saying it’ll be Trixie or Discord. What if it’s some other minor antagonist, like say Suri Polomare.
 

@Ping_chan
 
I don’t think they’ll waste one episode on Sunset Shimmer. That would be a complete waste.

Watch it be some Pony we never heard of.

@Vree  
My money’s on Sunset Shimmer.  
Although no one will know for sure until more hints are dropped for us…

My money’s on Discord.

Twilight’s paranoia and monomania will be going off the charts again this next episode, I gather?

@PonyPon  
Yeah. You can tell I’m a cynic when even I didn’t think of that.

@soundtea  
That’s certainly an optimistic forecast.

You know, it could be her misintrepreting something her and Trixie do as a relapse.
 
Then it turns out they got her a gift for rescuing both of them from their darkest moments.