Because we do not know what the last warriors book will be, it is impossible to know when it will come out. Although, if you mean the last book in the Omen of the Stars, that is coming out on April 2nd, 2012. For the series Warriors, the New Prophecy, and Power of Three, those are already out. Erin Hunter has concluded they will make a 5th series
The Last Hope came out in April 2012.
Early April (3rd or 4th) 2012
Well, time-wise, it's The Last Hope. But Erin is writing a new series called Dawn of the Clans, that is set before the Clans started. The first book, The Sun Trail, has already been released, but the second book, Thunder Rising, hasn't yet come out.
no
Warriors Return, the last book in Graystripe's Trilogy, will come out with Outcast, the 3rd book in the 3rd Warrior series, Power of Three. This book will be out on April 22, 2008. so that means it's already out. go buy it cause it's great! ^_^
Last Hope.
The Last Hope - Warriors - was created on 2012-03-21.
Either The Forgotten Warrior or The Last Hope
Who knows? The next book, entitled "The Last Hope" will release soon, and there will be many more to come after that. If you are wondering about a specific book, please specify.
The book after the forgotten warrior is the last hope.
Scrouge comes in the last book of the final series. It is called The Darkest Hour.
The 6th book of Warriors Power of Three is going to be released in 2010.