In case you didn't figure it our from the title,
this forum contains spoilers!!! So don't blame me for giving so
much away. That is your own
fault for looking at such
delicious intel.
To sum up this episode, Twilight Sparkle and her friends are in the new castle that Twilight got when she defeated Tirek. The castle all of a sudden forms a map of Equestria in the center of the castle, where the ponies thrones are located. The mane 6's cuite marks start to glow and vibrate. Why? Because the map is reflecting their cutie marks on a specific part of the map. Twilight Sparkle assumes that the 6 ponies must go there, for the place that the map located contains some information about why Twilight got her castle. When the ponies arrive at this place, the ponies within this little town are... off. They have (what is assumed to be) "fake" smiles. But that is the least of which stands out! Each and every cutie mark of every pony there has the same cutie mark! Each cutie mark is an equal sign. ( = ) The ponies want to find out why, so they go to the "ruler" of this town to find out. Starlight Glimmer is the one who is behind this. She thinks that friendship means that all ponies must be equal, in order to live together in harmony. Starlight then finds that Twilight is a princess, so she says this: "When everypony finds that a princess is giving up her cutie mark, they will soon find out what we are trying to accomplish..." The mane 6 don't know what Starlight has planned for the world... the ponies in this town end up trying to trap the ponies and steal their cutie marks. (Hate to say it, but these ponies are INSANE.)
Mind you, I don't know how this episode ends, but I will add another forum when I get more intel.
p.s. If you know this already, please keep that to yourself. Don't be hurtful and smart talk me.
Some ponies still don't know this, so respect them, too.
Have a fanddilytastic day!
~Lunar Glow