I searched and I found out where the Trailers are from. They were the same Trailers used in the Rai-English Version when airing Winx Club. ^^" So all the voices are from the Official Rai-English Voices when the Series were aired.
I agree about Season 4, we all seen that already. xD
But the only one that's real is the Movie which is Official came from the Toy Fair Sizzle, might be from the Licensing Expo because it's showing what's coming to Nickelodeon. =)
(That's why we didn't see the Commercial of it in Nickelodeon yet. ^^")
I'm guessing BelieveInWinx found it here: http://www.b2b.mtvni.com/mtvni/programs/pr...gram=winx_club#
It's under the links of Seasons 1 - 2, Season 3, Season 4, and Toy Fair Sizzle In the View Trailers Section.