Cortana should be available worldwide with all features, and not just for a few countries.
This appears to be a request for a feature to be added to Windows itself and should be submitted using the Windows Feedback app.
Shirish Nerlekar commented
Cortana should be available in Indian languages
please update Cortana Android India Final.Thanks.
slow working to app
Geoff Heldon commented
Seems like it is being removed more than added. I spent hours and 3 reinstalls on my Education edition trying to figure out why my Cortana wasn't working. Turns out, they silently removed it. Hours and days worth of work, wasted.
Doug Noyce (Windows Insider) commented
Cortana is still in preview stage and will be released in all versions (if not removed altogether) when Windows 10 Preview program is completed, and final version is fully beta-tested, reviews are completed and system is ready for release.