When will IOS 7 come out for iPhone 4S?

I already know what they features are, but does anybody know the exact date?

Same day for every device version except 4g and lower… Since they are unsupported.

Sometime in late september or october.
And actually it's coming out for devices 4g and up.
From the Apple website:
Device Support for iOS 7 beta
iOS 7 beta supports iPhone 4, iPhone 4S, iPhone 5, and iPod touch (5th generation). Support for iPad 2, iPad with Retina display, and iPad mini is coming later this summer.

IOS 7 beta 1 firmware will expires on 24th of July. After this expiry date we can expect iOS 7 firmware.
Aslo you can isntall iOS beta with out having devs account from here;
http://cydiaism.com/how-to-install-ios-7-beta-without-udid-developer-account/

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