Take this with the finest grain of salt, but according to Brownsista.com Janet will be releasing a single along with the release of True You: A Journey to Finding and Loving Yourself. Apparently, the single will relate to the overall theme of the book and Janet is rumored to be going back to Jimmy and Terry to record it.
http://brownsista.com/janet-set-to-release-true-you-in-2011/