Recently, Blizzard has outlined the next big patch for Diablo 3, which is now delayed until next week. The update is going to add some new gear for the Demon Hunter and Necromancer.
So, Blizzard is issuing an update for the game in the Public Test Realm (PTR) to put the next update through its paces before it becomes available worldwide.
Patch 2.6.9 was originally to begin its test run on Thursday, May 21, but according to an update on the Blizzard forums, the patch was for sometime next week. Which’ll allow for more QA time to do bugfixes along with other problems.
Update: The patch update is now available (May 24)