From MobileFun:
We recently received some interesting images that purport to be cases for both of the upcoming iPhone 6 models. The one on the right is for an iPhone with a 4.7-inch display, expected to be announced in June. The left case is for an iPhone with an even larger 5.7-inch display. This larger, phablet-sized model would be released in September.
And Nowhereelse.fr spotted some interesting details:
Note that there’s no opening for the top-mounted sleep/wake button that has been on all previous iPhone models (2). Coincidentally, there’s a new button cutout on the left-hand side (1)—Ming-Chi Kuo believes Apple is moving the button to the side this year to better facilitate one-handed use of the larger devices.