From a Friday, July 20 email:

Hello,
We’re renaming DoubleClick’s publisher platforms ‘Google Ad Manager’ to better reflect how our platform has evolved. Our goal is to help you earn more money and protect your brand wherever your audience is watching, playing and engaging.
What to expect:
Over the course of several months, you’ll start to see improvements to the user interface, but the core product and its functionality will remain the same.
Over the course of several months, you’ll start to see improvements to the user interface, but the core product and its functionality will remain the same.
While we may be bidding a fond farewell to the DoubleClick name, we're excited for a new and rewarding chapter in our journey with you. For the latest updates, follow us on Twitter and LinkedIn.
Until next time,
The Google Ad Manager Team

https://www.blog.google/products/admanager/introducing-google-ad-manager/

So we need to:

• update the branding
• keep an eye out for any API changes