I have read that there were plans of making a 4th season of H2O: just add water, but they cancelled it. I have also read there were plans of making a h20 just add water movie. But on wikipedia they don't say anything about a movie.

They now made a spin-off named mako mermaids. on the wikipedia page mako mermaids they say there's going to be a movie. In the movie old characters would appear like: emma, rikki, cleo, bella, zane and lewis.

What i want to know is what is true and what is not true? And is there a chance in the future they will make a 4th season or more seasons of h20 just add water?

I know that not everything on wikipedia is true.