Is there going to be a new a series of Warriors by Erin Hunter?

There are four series of Warriors books currently commissioned by HarperCollins publishers. The original arc, followed by The New Prophecy, Power of Three and yet to be released, The Fourth Apprentice.

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The fourth series is called "Omen of the Stars" The second book of that series is "Fading Echoes" and the third book is "Night Whispers".