About the 4chan """leak""", I remember watching the recent Metawatch for Underworlds and them saying that it's never been more popular. It could just be marketing talk coming out of their mouths, but it's not like GW say things like that overly often despite all their PR chatter. It's also not the wildest statement if they're going off model sales - we know that even if the game itself isn't being played, people generally love UW for paint projects.
It would be a strange move to suddenly decide to take it out back if it's doing as well as claimed. Plus, it's already had an established 'rotation' for semi-old sculpts in a way that most other systems don't, which would be a point in it's favour already if GW's concerns are with trimming down the amount of models they produce and store in a warehouse.
Finally it's 4chan slash /tg/ and how often are leaks from there ever actually reliable? 1/10 times, if that?