Per US CBP press release:
U.S. Customs and Border Protection today published a Federal Register notice officially expanding eligibility for participation in Global Entry to citizens from the Republic of Korea, Germany, Qatar, and the United Kingdom. Citizens participating in Korea’s Smart Entry System (SES), Germany’s Automated and Biometrics-Supported Border Controls (ABG) Plus, and select Qatar and United Kingdom citizens may be able to receive Global Entry benefits. While these arrangements have been previously announced, this notice serves to officially being implementation of the process.
Citizens of these countries must satisfy current program requirements, and will still need to fulfill application requirements, in order to qualify. Additionally, the Federal Register notice announces the ability for current U.S. Global Entry members to apply for membership in the Republic of Korea’s SES program, as well as the ability for a limited number to apply for Germany’s ABG Plus program.
This announcement formalizes eligibility that started back in October 2012. Some German and UK citizens have been able to apply for Global Entry through their airline frequent flyer program, see this successful report. Now all Germans that participate in ABG Plus are eligible, see the announcement from the German Embassy in the US.
South Korea Smart Entry Service members continue to be able to apply for Global Entry.
Qatari and UK citizen eligibility is still limited and I could not locate official criteria.
The following additional nationalities can receive Global Entry benefits: