She is performing Shake That tonight on X Factor, it's the final official lead single. Always was going to be the focus single but they pushed it back and decided to give Shake That another shot.
What You Want must be an instant grat track for pre ordering. Her label obviously want good first week sales for this and since her X Factor hype died down years ago and her competition is Adele, the price makes sense. I might even pre order it at that price.
