FOX did not pick up the pilot Delirium. It was based on Lauren Oliver's book by the same name, and Emma Roberts was the lead. I was super ecited for this one because, not only do I love Emma, but I also adore Gregg Sulkin from Wizards of Waverly Place who was also supposed to be in it.
Fans can demand for it on Twitter, and you never know, Fox just may bring it back. It has happened before i.e. Community and more recently the last episodes of 666 Park Avenue.
If you want it, go tweet!