As reported by http://www.unadinoi-winx.com/winx-club-returns-to-u.s.-tv-on-kidsclick/, Winx Club will return to US TV, on a brand-new kids' block called https://kidsclicktv.com/ starting this October. Winx isn't the only magical girl outcast from Nick airing there, either
Of course, this raises the questions of which dub and which seasons they will be airing... UnaDiNoi notes that it's more likely that they'll be airing Rai rather than 4Kids. The seasons are more up for grabs, as the show description at the KidsClick website mentions Darkar from S2... (Personally, I'm suspecting they'll air the Nick dub and air the recap specials instead of the full S1-2...)
Lets hope this time it is in the US to stay but I am not holding my breath
KidsClick just started airing Winx in the US this week, and based on some of the tweets I've been reading, KidsClick is airing the Rai versions of (at least) S1-2