I am seeing many videos about Jiocoin in my insta feed nowadays. Some are even calling it as the Indian version of Bitcoin. That's way too bullish I would say.
It is highly likely going to be a loyalty rewards coin for using Jio services which you can utilise for Jio services to get some discounts etc. it is highly unlikely to become a mainstream and independent crypto currency system.
But Ambani ji has his own way to surprise the country. Something radical may happen with Jiocoin in the coming days.