UPDATE: Cryptic just announced that the "big feature" is indeed the Nemesis Confrontation, a new 5-man lair that pits players against their Nemeses and culminates in a final showdown against Shadow Destroyer. You can read all about the Nemesis Confrontation update on the preview page. The update launches Nov. 24 and includes new costume sets and perks.

According to a post by Daeke, Cryptic is planning to launch a "big feature" next week in Champions Online. In order to test out the feature before it goes live, the team is hosting a "secret playtest" on the test server today. "This one's not a timed event. Once it's up on the PTS, you can try it out whenever you'd like," Daeke said in a thread on the official forums.

So what's the secret feature? Well, Daeke suggested that you bring a 5-man group of level 40 players to the PTS, as well as a Nemesis (although it's not required). It's safe to say that Cryptic will be implementing the 5-player vs. 5-Nemesis dungeon that's been mentioned in previous interviews, but more details should be released today. Regardless, be sure to hop on the PTS if you'd like to be a part of the testing process.