"We'll get back to you if there's a new development."
News reporter would say that at the end of the news? Or What would that be?

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Answer

Another way to say that would be, "We'll get back to you if there's any change." Sure, a news reporter might say that, but also a doctor about a patient or a businessperson about a sales deal or project.

Answer

He might say; "We'll get back to you if /as soon as there's a new development./ there are any new developments in this case"