Google has finally official confirmed that new large sitelinks (per query from 8 to 12) are available online now. You all can see in below picture:-
Google said, “Sitelinks will now be full-size links with a URL and one line of snippet text—similar to regular results—making it even easier to find the section of the site you want. We’re also increasing the maximum number of sitelinks per query from eight to 12.”
Google also improved sitelinks algorithm. Google said, “a significant improvement to our algorithms by combining sitelink ranking with regular result ranking to yield a higher-quality list of links.” Google said this “reduces link duplication and creates a better organized search results page.”