It has been confirmed by Jonathan Rotem's official website that he will be working with Britney on her next album, and has already started working on a track called "Everybody." It looks as if Britney's album just may debut late this year. The website says the following about Britney's new song:
2006 Unreleased Projects
Britney Spears - 'Everybody' on upcoming album (Jive)
Check out the website here.