I just got the official word - at 8:00 AM EST tomorrow, November 25, we will be taking down all the servers to take 1.55 live. Because tomorrow's patch will include the new character manager (remember, the first step to bringing you eight character slots!), the estimated downtime is longer than usual. We're shooting for two and a half hours, and we'll let you know if that changes.
i'm sure this is barring any unforseeable circumstances...heh