User blog comment:DMSwordsmaster/My Little Pony Season 3 Pilot Hype Assassination/@comment-4987919-20121115195719/@comment-4126310-20121117050826

If it's true what the creators have hinted at (a more serialised plot throughout the season), I would be very surprised if Cadance's cutie mark didn't come up again. Though if it doesn't, I guess the explanation is that she was always destined to rule over the Crystal Empire.