You can now apply Region and DMA Targeting via new, 'specific' Campaign properties:
To ensure that your creatives appear alongside content that is right for your brand, you can apply external brand safety to your campaign. See External Brand Safety.
You can now suppress specific publishers at the account level (i.e. for all campaigns). See: Account Level Blocking.
mass endpoint allows you to create a batch of campaign items - each item with a
thumbnail that you provide.
When creating a new custom audience, you can use the
exclude_from_campaigns field to exclude that audience by default from all campaigns.
The API now provides a
reject_reason field for Campaigns and Items. If the Campaign or Item were rejected, the
reject_reason field provides the reason.
Network-level Custom Audiences can now be targeted (Bug Fix).
It is now possible to target Lookalike Audiences through the API.
It is now possible to create/update a Custom Audience Rule through the API. The API also allows you to configure default suppression settings for the custom audience.
The API now provides an
audience_size field for Custom Audiences (as well as Marketplace Audiences).