The Patch 1.13 thread on the Battle.net Forums has been updated with word of yet another setback for the Diablo II version 1.13 patch first mentioned in March (thanks Rhialto). Now it sounds like Blizzard is just stuck for the moment for how to deal with the overdue update for their action/RPG:

The decision on whether or not to include the enlarged stash size has been slightly delayed. As mentioned previously it would require some additional weeks of development and would remove one of the most requested features were we unable to include it. If it were to be included the concern is that it could render Diablo II unplayable, and repairing the issue after the fact would draw heavily on development resources. Which is also something we obviously want to avoid.

We hope to be able to reach a conclusion and decision soon on the future of the 1.13 patch, and we’ll keep you updated as it develops.