Google’s Elena L. said in a Google Webmaster Help thread that the new news carousel that is powered by AMP content that went live on February 23rd is only live in 12 countries. Google will be expanding them to more countries but here is the full list provided by Elena at Google.

United States
Brazil
Germany
Spain
France
United Kingdom
India
Indonesia
Italy
Mexico
Japan
Russia

There is no timeline on when the news carousel will expand further.

Forum discussion at Google Webmaster Help.