Lisa Wang from Google mentioned that they have fixed the indexing issues faced by some publishers. In short, the content from the news publishers will not show up in the search results, for days and hours on end, after that content was indexed. Google has now solved the problem.
Lisa Wang wrote in the Google News Help thread that the issue has been fixed. There is no action to be taken by the publishers. She thanked the publishers for complaining about the issue and for the patience shown by them while the issue was being resolved. However, not all publishers are saying that the issue has been fully resolved yet. But Google says that it has been solved.