It’s not sure at 100% but it seems Britney refused to be a judge on the next X Factor season because she’s working on her new album, possibly released in the end of 2013.
It seems Darkchild (one of her most famous producers, check "Overprotected Remix" and "I Love Rock'n'Roll") brought her in the studio for recording a new demo for her new album and not only once.
Then, Wroldsen Ina, “He About To Lose Me” composer and songwriter is come back to work with Britney for the 8th album.
Today during an interview she revealed: “During the summer, Rodney Jerkins (aka Darkchild) and Andre Lindal, contacted me from LA for writing again for Britney. They said she loved the lyrics of the last song I wrote for her “He About To Lose Me” and she would like to work again with me. It’s been an amazing experience and I hope to do it again!”