Image imported from derpibooru 
Original Description:
 
At midnight, Princess Celestia sleeps from her bed. And she heard a whisper from a past “Princess Celestia” a whisper voice said. Now she feels sad about a past: A young student who betrayed and enter the portal, she worried about her and a voice repeat again “You’re a hypocrite! You don’t even had friends!” She shouts and finally fades and now, Princess Celestia awakes and gasps. She feels scared about her old student from the past. Princess Luna arrives to Celestia for what’s happening “Sister, are you alright?” She ask “Send to the leader of the Autobots, I want him now!” She said to Luna and Luna gasps and he needs transmission to Optimus Prime. In Cybertron. Optimus Prime, checking the tablet, until they found a receiving message to Princess Luna from the webcam “Optimus Prime, Princess Celestia is expecting you. She must speak with you. hurry” She said and the video stops. Optimus Prime knew about the message of Princess Celestia. And this could be a new adventure.
 
The Transformers will Return by a sequel to My Little Pony:
 
 
Transformers: Equestria Girls - The Journey to Friendship and Leadership