Update: Microsoft is now rolling out Windows 10 build 14926. More details here.
Original Story: Windows Insider team is now working on build 14926. The latest Windows 10 build 14926 and mobile build 10.0.14926.1000 is now under internal testing. The current internal build is compiled on September 10, 2016.
Microsoft may release new build today for fast ring insiders. There was no build release last week because of server update. We can expect Windows 10 Redstone 2 build 14921 to be released today or tomorrow for fast ring insider members.
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.