The Annual summaries for worldwide and individual regions definitely need to come back! I really miss those.
As for anything beyond that, well... it's already available. I can go to the game comparison tool and see the weekly sales figures for any game for every week that's been tracked. So what not make it all viewable on the game page as well?
Bet Shiken that COD would outsell Battlefield in 2018. http://gamrconnect.vgchartz.com/post.php?id=8749702