Blizzard has posted (though you can not) to announce an upcoming reset of the Diablo 2 ladders.
The Diablo II ladder will be resetting on September 28. When reset, all ladder characters will be moved to non-ladder. To play in the new ladder season you will need to create a new character.
You’ll note that this is the same day as Blizzcon! OMG new secret D2 patch content stuff! Oh wait, it’s a month before Blizzcon. N/M, then.