How much space will ios 7 take up?

I have a 8g iPhone 4 with 2.7 gigs of space left. I want ios 7 when it comes out, ( bty what day ios 7 come out ) how much space will it take up, and will I have enough memory?

IOS 7 comes out in the fall, but you can try it early if you register your device on http://www.instantudid.com/.It's only $5 and they did mine instantly.

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