http://9to5mac.com/2015/11/27/iphone-7-headphone-jack-lightning/ Means that if this rumour is true, Apple plans to build new phones even slimmer than they are already. A huge disadvantage in my opinion is, that you cant charge your phone anymore when you want to listen to music, so that would be a either-or decision.
What about the environment? Nobody cares for that? Because of idiot Apple there is a zillion of wasted chargers every time they change their port standard... nearly all phones use 3.5mm jack for headphones and mini usb for charging... but Apple wants its own headphone jack and their own shitty lightning or thunderbolt or whatever they call it. It seems like people don't think about this...
The iPhone 5 was also rumoured to be the first transparent phone. This is almost certainly bullocks as well.