I'd say this is a mishmash report where they repeat something that may or may not be fact/rumor, but in a garbled way.
You have Cortana or not. It does not split by model, only Region.
If India has Cortana in a Beta form it would be for every WP device in India wich has the correct settings.
Also, Denim is pushing out. They aren't changing anything in Denim, just for India, just for "higher devices," just to bump Cortana to Beta.
They may make a separate push of a Cortana Beta to India... But again that would be to all of India, yes?