This week we covered the Google one language per page rule and today I spotted a thread specific to how this works with Google News.
A Google News Help thread has Googler Inbal saying you should submit a News Sitemap file for each language. Inbal from Google said:
If all your languages editions are published on one site, the Google News preference is for one news sitesmaps for multiple languages.
It is also important to set the language in the News Sitemap file using the n:language tag.
For more on News Sitemap files see here.
Forum discussion at Google News Help.