Microsoft will release new insider build next week. The company is updating its servers so no new build release this week. We can expect Windows 10 Redstone 2 build 14921 to be next insider build for fast ring members. Meanwhile, Windows Insider team is now working on build 14923. The latest Windows 10 build 14923 and mobile build 10.0.14923.1000 is now under internal testing. The current internal build is compiled on September 7, 2016.
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 and Mobile build 10.0.14393.105 for release preview members. Microsoft also released Xbox One Preview update for insider members.