Microsoft Windows insider team is testing Windows 10 1607 cumulative update build 14393.294 for PC and Mobile 10.0.14393.294. This is a big jump from current build 14393.187. The latest update build is compiled on September 19, 2016.
Recently, Microsoft had released a cumulative update kb3189866 build 14393.187 for Windows 10 1607 users and Mobile build 10.0.14393.189. The company had also released Redstone 2 build 14931 for fast ring insiders.