Unfortunately, they don't show many overall stats-- I'd like to see, for example, the numbers of teams from each battlegroup or realm (checking my own realm shows me that no teams made it, but you'd have to check every single realm to see numbers across the board). Do you think PvP realms turn out more successful Arena teams? I'd also like to see the average rating of the teams that made it-- just a random browse across realms shows that you'd have needed at least a 2200 rating in 5v5 to get in. The highest teams hit around 2500, it looks like, and here's an interesting point: The arena rating is based off of chess' ELO system, and in that system Gary Kasparov, the best player in the world, was the first to break the 2700 rating. So my guess is that we'll see generally higher ratings than these in season two, and so on.
Anyway, a nice little tribute to players who were successful in season one. Hopefully, we'll see better insights coming out of these numbers than Blizzard has provided here, but in the meantime if you want to see who on your realm is a heavy hitter, the HoF is the place.