Is the new ios 9 going to be available for iPhone 4s?

Is the new ios 9 going to be available for iPhone 4s? - 1

I doubt it. When a new IOS comes out the oldest models don't get it. The 3S never got IOS 6. The 4 did not get IOS 8 and I was surprised it got seven so odds are against the 4S getting 9.

It doesn't matter though. When IOS 9 comes out if it does work on the 4S people will complain about how much it sucks or complain that they did not get IOS 9. IOS users are hard to please.

Unless there's a crystal ball no one knows

Actually, if recent reports are to be believed, Apple has changed how they make updates for older devices, so through that, iOS 9 for the 4s is possible. We would have to wait until WWDC to find out for sure, where they would at least discuss it & release the beta to developers