Microsoft Windows Insider team is now working on build 14920. The latest Windows 10 build 14920 and mobile build 10.0.14920.1000 is now under internal testing. This build could be released too fast ring insiders next week. The current internal build is compiled on September 2, 2016. Previously, insider team was working on internal build 14918.
Recently, Microsoft had released last Windows 10 Redstone 2 PC build 14915 and first R2 mobile build 10.0.14915 for fast ring insiders. The company also released cumulative Update KB3176938 build 14393.105 for Windows 10 Anniversary Update users.