Unfortunately for us Americans, the US teams didn't put on much of a showing -- they dropped out quick, and WoM reports that their behavior after the losses was less than classy. They apparently blamed a teammate for dropping out, and it doesn't help that, unlike the Korean teams who have played the same classes and characters for a long time, the Americans apparently came up with their teams and tactics only recently. Looks like they'll have to do a little reforming and rebuilding before this year's BlizzCon.
Congrats to all the teams who walked away with victories in the ESL's Arena tournament. Even from Ming's commentary, it sounds like it was an exciting few days for Arena players.