[Update: Patch 2.6.9 is now live on the PTR. Changes include new Necromancer and Demon Hunter sets, skill changes for the Necromancer, and Legendary item changes. The update arrives on PTR a full week after it was originally planned to deploy--according to Blizzard, "additional QA time" was required to address bugs and other issues.]

Original story follows...

Blizzard is issuing a new update to Diablo 3 in the public test realm (PTR) to put it through its paces before it becomes widely available. The 2.6.9 patch was originally going to begin its testing run on Thursday, May 21, but according to an update on the Blizzard forums, the patch has actually been delayed to the week of May 24 (that's this week) to allow for "additional QA time" to fix bugs and other issues. As of May 28, there's been no further word on when the PTR update will arrive and word on the official Diablo account on Twitter has been scarce. We'll report back whenever a release date is shared.