It was the end of an era, but the start of an age. On Thursday (Nov. 13), Taylor Swift revealed more from her behind-the-scenes documentary Taylor Swift: The End of an Era with a longer trailer that promises “an unprecedented look” at what made her earth-shattering Eras Tour tick.

Fans can likely expect many easter eggs to decipher when it premieres – and perhaps some unanswered questions too (What exactly was the meaning of the gold Reputation suit? Why didn’t she wear certain 1989 outfits?). But the two-and-a-half-minute-long video does offer a few new insights.

In the preview, Swift – whose 12th studio album The Life of the Showgirl broke the modern-day record for equivalent album units sold in its first week with 4.002 million and has currently spent five weeks at No. 1 on the Billboard 200, with its lead single “The Fate of Ophelia” also sitting on top of the Hot 100 for the same amount of time – and those around her share both personal revelations and technical aspects of working on the show.

“I’m very aware of mysterious forces at play that I will never have any control of,” she narrates. “This show created a bonding experience for like 70,000 people all at once. There’s something very special about that.”

The six-part series – which pairs with The Eras Tour: The Final Show that includes The Tortured Poets Department set – begins with its first two episodes on Disney+ on Dec. 12, just in time for Swift’s 36th birthday on Dec. 13. Below, read about the nine new things we learned from the freshly released footage.