According to the following explanation from 9to5Mac, the iPhone 6 won’t display more information compared to the iPhone 5s, same stuff but at a higher resolution… Just like the iPhone 4 did compared to the iPhone 3GS. Mmmm… I would have preferred same resolution but with more content on the screen…
This means that Apple will likely be tripling the aforementioned “base resolution” (568 x 320) of the iPhone screen in both directions, and that the iPhone screen resolution will be scaled with an increase of 150% from the current 2X resolution of 1136 x 640. Of course, Apple tests several different iPhones and display technologies, so it is possible that Apple chooses to take another route for display specifications for the 2014 iPhone upgrade.
1704 likely the new 1136:
568 tripled is 1704 and 320 tripled is 960, and sources indicate that Apple is testing a 1704 x 960 resolution display for the iPhone 6. Tripling the iPhone 5′s base resolution would mean that the iPhone 6′s screen will retain the same 16:9 aspect ratio as the iPhone 5, iPhone 5s, and iPhone 5c.