The report, citing a “reliable source,” claims the new same-sized Lightning connector will support Lightning-equipped and Bluetooth headphones, and have a DAC, or digital-to-audio converter, for backwards compatibility with wired headphones using standard 3.5mm stereo jacks. A 3.5mm to Lightning adapter would be required.
I really don’t care for the iPhone to be any thinner. I just want the 4.7″ model to have the battery life of the 5.5″ model, or better. That’s the only reason I currently use a 6S Plus.