Although "The Legend of Korra" Book 3 has just ended, spoilers have already surfaced due to a recent trailer footage that appears to be from season 4.

As reported by Emergency Awesome on YouTube, images and screencaps from a "Legend of Korra" Book 3 TV trailer appear to be from the final season of the animates series, and they provide possible spoilers as to what Book 4 will revolve around.

First an image that has been circulating the web is that of Kuvira, who was somewhat heavily featured in the finale episodes of "The Legend of Korra" Book 3. Based on the image, many fans theorize that Kuvira could be a villainous character in Book 4.

"It seems like based on this, [Book 4] will be a continuation of end of Book 3, but there won't be a giant jump in time," said Emergency Awesome.

"We don't have any kind of confirmation on what Kuvira's backstory is, other than what Suyin has told us, but there are a lot of really cool theories."

One popular theory is that Kuvira is the love child between Zaheer and Suyin, based on a photo shown in a "Legend of Korra" Book 3 episode.

"It all stems from this picture that was in Suyin's office of her and her circus troupe," added Emergency Awesome. "It just looks like this person is Zaheer, so it's possible they had some kind of relationship, and Kuvira was the result of that."

According to Avatar the Last Airbender Online, the release date for "The Legend of Korra" Book 3 is set for December 2, 2014, coming much sooner than the previous DVD release for the Nickelodeon series.

Since DVD and Blu-Ray release dates often come close to the release of the following season, fans are anticipating an air date that could come as soon as the beginning of next year.