WINX is going to come in 2011 ,so don't worry about winx club season 5.
When i asked on the web if there was going to be a season 5 then they said that it was going to come in 2011 around november exactly a year from today.OH sorry i forgot to mention they it was going to come on nick next year.

They also said that there was going to be a season 6 also.
So enjoy
I will post in my blog more about the winx