Windows insider team is testing Windows 10 PC build 14943.1000 and mobile build 10.0.14943.1000. The latest internal build is compiled on October 4, 2016. The last insider build released for PC was build 14936 and mobile build 10.0.14936.1000 .
For Windows 10 1607 Anniversary Update users, insider team is working on cumulative update build 14393.321. The company is also testing cumulative update build 10586.601 for Windows 10 1511 Threshold 2 PC and Mobile users.