when is h2o going to have the forth season out on teen nick

I am a huge fan of h2o and upset to hear they is no 4th season ,because all the girls are too old and have other projects on. Emma/Claire=Vampire Diaries Cleo/Phoebe=Secret Circle Rikki/Cariba=A lot of projects and the others have a few on too.I am sorry that this is not what you wanted to hear though there is a spin off series coming soon call mako mermaids.