User blog:TrustedUser/RAINBOW OFFICIAL STATEMENT ABOUT "THE LILO"

From the rightful source, it has been officially confirmed directly from Rainbow that "The Lilo" is the 5th episode created for season 5, however it is not the proper 5th episode of the main season 5 story arc. "The Lilo" is a stand-alone episode, where both Nickelodeon and Rainbow agreed was the episode chosen to use to launch season 5.

Here is the source: http://www.michaelsfavorites2.com/winxclub3/newspage.html