Will the iPhone 4 be able to get iOS7?

I can see the iphone 4 running ios7 quite slow. Maybe on purpose or just built around dual-core CPUs. The reason I think this is that there seems to be quite a lot of people still happily using an iphone 4 and Apple won't want this.
 
Beta 1 and beta 2 were smooth enough on the 4 and 4s I tried. Can't see the final release getting any worse, if anything they should get smoother.
 
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