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A WebmasterWorld thread has a report from an SEO of a new Google Webmaster Tools alert.
The new alert is named "Detected New Page" and warns the webmaster that a specific URL was replaced by another URL when Google feels it has been replaced.
Why would Google think it would have been replaced? Either a 301 or 302 redirect was set up. Maybe the content is too similar to another page?
The message reads something like this:
The URL www.pandalized.com/page.html is no longer appearing in Google search results because our algorithms have selected www.freshsite.com/page.html instead. Please see this Help Center article for more information about this message.
This is the first report I have seen of such an error in Google Webmaster Tools message center.
Forum discussion at WebmasterWorld.
Update: John Mueller told me this is actually new as of about 1.5 months ago.
Comments:
SAP Training
12/20/2011 12:04 pm
I have also seen such a error message but i have not ever think about that message. thanks for this info.
SEO Translator
12/20/2011 08:17 pm
Amazing, but I've never experienced that one. I wonder whether this is an error or a new feature? It might be worth looking into this kind of message to find out why this happens. Does it happen to the page that was redirected or to the target of the redirection?