Season five has been confirmed to show in Italy. It will air in 2011 in Italy, and will come after the second movie of the Winx Club. 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 (about which nothing is known for the time being, even if so-called "Season 5 transformations" appeared on the internet, which were all proved to be fanarts; nothing is known about season 5 with the exception of the above information). The information can be verified from this site (in French): Saison 5, on Winx Magic sur Kazeo.
However, from the Licensing Show 2010, via Michael's Winx Club, it has been confirmed that Roxy will be present, as the seventh Winx in the upcoming season. The quote is here: "A new Series Five, with further adventures of the seven magical fairies, is in production and will be ready in Fall 2011!" It can be read here:Michael's Winx Club News Page. In 2010 it was publicly announced that Nickelodeon gained the rights for Winx Club in the United States, the United Kingdom, Latin America, Canada, Australia, New Zealand, Belgium, The Netherlands and Luxembourg and that it will be co-producing Seasons 5 and 6 along with Rainbow.
Taking from>Winx Wiki
Serbian-
Potvrđeno je da će se 5 sezona Winx premijerno održati u Italiji, u FEBRUARU predstojeće godine.O ovoj sezoni se još ništa nezna,osim da će likovi i koncept dobiti neke izmjene,a glavna atrakcija je ta-kakve će transformacije Iginio sada izmisliti.Neke podatke možete provjeriti sa stranica u gornjem tekstu.Nedoumice su riješene,i ROXY će se prikazivati KAO 7 ČLANICA.Kao što i sami znamo,radiće se u produkciji Rainbowa S.P.A i Nickeledona,pa svi koji vole-nek izvole.Nisam baš shvatila kako prevesti da je Nickeledon stekao prava Winx Cluba u Sjedinjenim Američkim državama,Velikoj Britaniji, Latinska Amerika, Kanada, Australija, Novi Zeland, Belgija,Nizozemska i Luksemburg te da će se co-proizvodi Sezone 5 i 6 zajedno s Rainbow.
THANKS A LOT TO: Winx Wikia