Ever since the "Through the Never" premiere date approached, Metallica ranks have been buzzing with exciting updates. And just when the fans thought that metal titans ran out of major announcements, drummer Lars Ulrich dropped what might turn out to be as yet another Metallica bomb. During a radio chat with 107.7 the Bone, Ulrich confirmed that "another frontier" is approaching, noting that the band's management would rip him even for the very mention of it. "There's a very interesting thing coming our way in December," he said. "Nobody knows that, so ... There's another frontier heading in Metallica's direction in December. Which, if anybody [from Metallica management] even knew that I just said what I just said, they would hunt me down and silence me. But there is another frontier coming in December, which we're very excited about." Apart from the vague statement, Lars discussed the band's ethic during a recently posted "Through the Never" behind-the-scenes clip. In his words, "When Metallica creates, we create for ourselves. We know, or have learned along the way that if we do what we do for us, it has a purity and that makes the best Metallica." An interesting theory surfaced online regarding the mysterious "Through the Never" bag, claiming that it in fact contains the spirit of late bassist Cliff Burton. As previously reported, the film's storyline revolves around main character's search for the bag he was sent to find by the band. Supporting such a claim, the moment when Dane DeHaan arrives with the bag finds the band on the scene playing "Orion," a song featuring one of Burton's staple bass lines. And in addition, the movie itself was released on the 27th anniversary of Cliff's death. But sticking to cold hard facts, "Through the Never" officially made the biggest concert film opening in IMAX history with $1.7 million earnings. As Wrap reports, the impressive figure was only enough for the concert movie domain, since metal giants couldn't beat the $3.1 million earnings "The Wizard of Oz" re-release scored last weekend. After the September 27 IMAX premiere, "Through the Never" is set to be rolled out to regular 3D cinemas this Friday (October 4).