Update - Multiple updates today. First off, the new ad format (yellow [Ad] boxes) is at close to 90% of our data set, after months of testing. The new design seems to be rolling as well, or is at least in aggressive testing. Google continues to test changes to In-depth Articles, with most tests showing a substantially smaller footprint.
The example below shows all three things (new ads, new design, in-depth test) in action. Notice that this in-depth block is close to the top of the SERP, compared to current in-depth blocks at or near the bottom.