Gary Illyes from Google responded to an SEO on that topic and said on Twitter that the news sitemap index count issue will "take a while to fix."
That to me implies they haven't begun looking into it, seeing it only impacts a small percentage of Google Search Console Sitemaps users.
@GustavoValverde mmm, this should affect only web search. News is a known problem, will take a while to fix :-/— Gary Illyes (@methode) August 22, 2015
I was hoping it would have been fixed by now, but I can understand that Google has priorities and News publishers are probably not at the top of those priorities.
Forum discussion at Twitter.