It was rumored that Microsoft is working on Windows 10 Threshold 2 and it may be arriving in the first week of  November, but Microsoft failed to sign off the TH2 build. However Windows 10 Threshold 2 or Windows 10 (Fall update) will bring performance improvements, bug fixes and new features like new messaging app.
Now a Microsoft Support Engineer has said that Windows 10 November update or TH2 is coming to public on November 10. When A Windows 10 user asked that when Cortana coming to India, In the response Microsoft Support engineer said that “Cortana will be available in India after November update releasing on November 10th, 2015”
So, we expect that Microsoft will soon releases a Windows 10 TH2 (RTM) build to Windows Insiders, sometime next week.
Source: Microsoft Support Via: WinBeta