Windows insider team is currently testing Windows 10 PC build 14939 and mobile build 10.0.14939.1000 internally. The latest internal build is compiled on September 28, 2016. Recently, Insider team had released build 14936 for PC and mobile build 10.0.14936.1000 for testers.
A new Windows 10 Cumulative Update PC build 14393.222 and Mobile build 10.0.14393.221 is also available for Preview Branch and Slow ring members. For Windows 10 1607 Anniversary Update users, insider team is working on cumulative update build 14393.314. The company is also testing cumulative update build 10586.596 for Windows 10 1511 Threshold 2 PC and Mobile users.