Microsoft is now testing Windows 10 build 16190 for PC. The new Microsoft Windows 10 Redstone 3 build 10.0.16190.1000 (rs_prerelease.170503-2213) was compiled on May 3, 2017. Windows Insider team is also testing Windows 10 Mobile build 15210 (10.0.15212.0 feature2.170503-2313).
Recently, Microsoft also released Windows 10 Redstone 3 build 16188 for PC Fast Ring Insider members with lots of new features and improvements. The company also released Mobile build 10.0.15210.0 feature 2 with minor improvements.
Official Windows 10 Mobile Creators Update build 15063.251 is now available for download. However only selected Windows phones will receive the update. Read more details here.