According to this video on WinBeta , build 10512 is from the "TH2 branch" of builds, which is apparently the branch for Windows 10 Update 1 builds. Windows 10 Update 1 is rumoured to be released around October, and Skype integration is thought to come with it. With all this info/speculation, do you think it's safe to assume that Skype will be integrated to Phone/Messages when Windows 10 Mobile is first released?