If you do a search in Google News, you may now see an option at the top right that reads "Sorted by date with duplicates included." Here is a screen capture:
This is a brand new option and even the help documentation is not updated to explain how this differs from the two other options; "Sort by Relevance" or "Sort by Date."
One would assume that Google is now filtering out duplicate stories in Google News, if you select sort by date.
Forum discussion at WebmasterWorld.