From the Guild Wars 2 Official Website:
Hello, everybody! I’m Tyler Bearce, one of the game designers on Guild Wars 2. Thank you for participating in Temple of the Silent Storm Week, where PvP paid tournaments were temporarily changed from 8-team, 3-round events, to 2-team, single round matches. So far, the response to this change has been overwhelmingly positive!
Due to your feedback, we’ve decided to keep this format for paid tournaments. At the beginning of each week, we will select a different map to feature in all paid tournaments for that week. The free tournament format won’t change. The next map will be “The Battle of Kyhlo.”
A number of players have mentioned that while they like our new tournament format, they’d be much happier if we also had matchmaking. So we are happy to inform you that we have begun testing our ratings and matchmaking system. Currently in-game, players are rated based on their performance and teams are matched based on those ratings. However, this system is still being tested and tuned; we’ll have more information about this in future updates.
Thanks for continuing to support us! See you in game!