Does the book GONE by Michael Grant have a sequel?

Yes, there will be a sequel to Michael Grant's "Gone". The name of this book will be "Hunger" and it will be hitting the shelves May 26, 2009. So there's not much of a wait.

After Hunger will be Lies and the book will come out on May 4, 2010.

It will be a 6 part series. After Lies is Plague, then Darkness and Light. Michael is almost finished with Plauge as he said on his twitter.