User blog comment:RoyallyBella/Official Season 7 discussion blog/@comment-27000514-20160602171239/@comment-2056915-20160603035233

Rainbow and Nick are actually "joining together" even in Season 7, and Nick cast does not return.

I am surprised that the realeasedateportal site does not mention the DuArt cast. Hmm. This site makes me feel suspicious.

The Youtube link mentioned that WOW will be aired in April, but it is June now. So, I doubt if the rest of the content is trust-worthy.

I'd rather having information from Winxclubrus, Una di Noi or other trustful places. Still, thanks for sharing.

P/S: Having all the characters return is ridiculous as they will barely have time for every single of them. Just take a look at the Winx's bonders - pixies (and pixie animals), fairy pets (and pets), selkies and fairy animals - and the minor Alfea fairies. Oh... too much already to be honest.