Just in case - I'll call it · 12:44am Oct 15th, 2015
Because now I'm 75% sure, especially with that Art of Equestria book snippet. So mark my words ponies...
Starlight moves to be a recurring character in Season 6! Basically this means not a main main, but close.
This will be cringey if it doesn't happen...
I may be only doing this because I had also predicted April 4th for the Season 5 premiere back in November.. soo...