Google new Standout meta-tag
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As it states on the google link "put the tag in the HTML header of one of your articles," - the post from google implies that it will only be picked up by automated news systems anyway, which work differently from rss and other feed styles.
If you currently publish a google news sitemap that is submitted to google news, it would imply that they will only pick up articles with the tag that are in that feed (so if you put the tag on your home page for example - it won't get seen)
Google news sitemaps/feeds have a limited lifespan anyway - if you are already publishing one, take a look at it in your webmaster tools account - you should see that there are far fewer urls in the sitemap than actual news pieces you have published (over time) - roughly a months worth of urls at any given time.
Given that (and this is guesswork/assumption here!) google limits the number or urls it recognizes in a news feed from a particular source to what would appear to be an average months worth of submissions at any one time - the chances are that google can quickly see if you are exceeding the quota of 7 per week.