Deployment plan:

• Stage 1: test.wikipedia.org and test2.wikipedia.org. Already done.
• Stage 2: mediawiki.org. Planned for deployment on August 15.
• Stage 3: traffic percentage. A small percentage of all requests will be sent to the nearest DC. Date undecided, but could be as early as August 22.
  
• Stage 4: full deployment. Date TBA. But it will be soon. If you need to update your tools, please start updating.
  

For more details, see T279664.

I'm aiming to do stage 3 and 4 on September 6.

-- Tim Starling