Princess Celestia understands that being an Element of Harmony is dangerous, and that Twilight and her friends are bound to make enemies. So, naturally, the only course of action is to send a guard to keep them safe, even if they don't know about it.
Waking up in a void, Twilight unable to remember how she got there. After which, she is met with a hovering box of text asking her if she would like to start over.
The Ponyville Public Access channel is where any and all Ponyville residents can go to advertise whatever they want or force those with a T.V. to watch their antics.
Where there is light, there must also be a shadow, and the brighter the light, the darker the shadow. While king Sombra might be gone, he was never a pony to disappear quietly. As Cadence's pregnancy nears the end, his revenge is starting to unfold.