Aratil has posted the early US standings, and Vaneras has posted some early EU Arena tournament standings (the actual tournament doesn't end for a few weeks yet, so it's far from over) on the forums. Strangely enough, while RMP still rules the day in the EU (three of the top teams there, including the first place team, are made up of a Rogue, Mage, and Priest), Death Knights have taken over the rest of the tournament. The American side has seven out of 10 teams made up of Death Knights, Paladins, and Warlocks, and another team that subs the Warlock for a Hunter. And on the EU side, five out of the ten are DK, Pally, Hunter as well.
Arena players were worried in the last pro tournament that Death Knights might take over the Arenas and it looks like that might be what's going on here. Of course, there are still weeks left to go, so anything could happen, but as it stands right now, looks like the final winners will probably have plenty of Runeblade wielders in their ranks.