There are very, very few major shocks in the rankings. For instance, in the current implementation (let's say v0.9) only 2 teams drop out of top-20 and all(!) top-10 teams are still in top-10. Like I said, this is still subject to small change, but I'd say it's good to see that the top teams are still top with the new concept of Team competition (where 90% of points come from powerteam rankings).
The user league might be a bit more spectacular as more weight has been put on scoring gold in highly competitive rankings. For instance, MTP04's recent slam dunk in the GeForce 8800 GTS 512MB ranking will help pushing for top-30.