We have built new phonetic keyboards for 10 Indian languages that allow users to type on a familiar QWERTY keyboard layout and the IME converts what they type into their native script. Here is the list of new Indic keyboards in Windows 10 Mobile.
Hindi (India) Phonetic
Please join the Windows Insider Program to get the Windows 10 Insider Preview. On the preview builds, you can use the keyboards by enabling these in Keyboard setting (Settings – Time & language – Keyboard). You can switch keyboard by using Space key with swiping gesture. We hope you all will try them out and send us feedback and suggestions via Windows feedback tool or Windows Insider Preview Community Forum (http://windows.microsoft.com/en-us/windows/preview-updates-feedback-phone) so that we can make these features even better.