When this super secret new feature hits the PTS tomorrow, it will not be as a timed event, so you can log in and take a look at your leisure. Don't have any speculation as to what it is yet? A few simple instructions on what to bring to the party might help. Daeke requests that you bring a 5-man team of level 40 players and interestingly, a Nemesis.
If you want to participate you can either transfer your own characters over from the live server, or level up using the contact outside the Millennium City Powerhouse.
Champions Online promises more information tomorrow -- we can't wait!