The teardrop design was rumored for the 2011 iPhone. There were no physical leaks, unlike for the real iPhones 4, 5 and 6 (all of which leaked several months before release), similarly to this year's iPhone 7.I believe the whole "teardrop" design thing was around for quite much closer to the actual announcement of the phone.
http://venturebeat.com/2012/05/29/leaked-iphone-5-case/ From May 29th 2012
http://bgr.com/2014/03/31/iphone-6-leaked-pictures-rear-shell/ From March 31st 2014
https://www.macrumors.com/2014/04/08/iphone-6-renderings/ From April 4th 2014
http://gizmodo.com/5520164/this-is-apples-next-iphone And of course the lost iPhone 4 from April 19th 2010
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