The Global Replays Reporting allows you to drill down into the replay data over the last few seasons. You currently can include over 20+ metrics, 11 different group by options, and many filters to create any number of reports you might be interested in.
Example 1v1 Win % by Matchup in the last 30 days
Lets say you wanted to see the win rate for PvZ broken apart by all the leagues for Season 36. View Report 
How about in Season 36 which day of the week do players have the best Spending Quotient. View Report
Have fun pulling data in fun and creative ways, let me know what you come up with and what you find interesting!