No word on that just yet. I'm pretty sure the service will make its way over to India as the demand is pretty huge and console hardware is significantly more expensive. Let's hope we get some official announcement soon, hopefully by the year end.
unfortunately, there is no public roadmap related to a rollout Stadia to new countries and regions. You might want to follow the Stadia team on Twitter to stay up to date. (https://twitter.com/googlestadia)
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