It's interesting how many "looks like I'm going to S3 if this taller phone happens" comments there are when the rumored iPhone 5 and the S3 both have about 16:9 aspect ratio. Actually, the S3 is slightly taller. Are people only going with iPhone because they want the smaller aspect ratio?
S3: 1280x720; 1280/720 = 16/9.
5: 1136x640; 1136/640 is a tiny bit less than 16/9.
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It's not the screen aspect ratio that matters, it's the phone's aspect ratio. The S3 isn't as tall a the iPhone 5.
https://forums.macrumors.com/posts/15418871/