Season five has been confirmed to onyesha in Italy. It will air in 2011 in Italy, and will come after the sekunde movie of the Winx Club. This season will also air in America in Febuary of 2012.
Almost nothing is known of the season, except that the series itself will experience a change, that the Winx will change their looks again (reminiscent of earlier seasons; like in Season 4) and will gain a new transformation. Currently, there is no information about their new transformations. The information can be verified from this site (in French): Saison 5, on Winx Magic sur Kazeo.