Hi Daniel, this is Strawberry. I have confirmed with our Sr. Engineering Manager, April Linden, that over half the regions in Second Life are now running in the cloud.
Since this was a few days ago, The Lab has no doubt continued it's work. How long will it take until the move is complete? Daniel Voyager himmself thought it would be "six weeks or so."
Source: Daniel Voyager's Blog
Image Source: Linden Lab