I have to disagree with the desire for Apple to remove the 3.5mm headphone jack, in exchange for the lighting port.
If Apple were smart, they'd use both. For one, I agree with the idea that closely related generations of Apple devices need to be as similar as possible, so that everything is interconnected.
However, the MBP is not an iPhone. It's a personal, portable computer. This means that people use analogue headphones on these, far more than on phones. Phones are usually paired with bluetooth headsets.
One area where removing the jack would be unthinkable, is in the are of video and audio content creation. More people than most of you realize, have expensive headphones and audio systems that require a headphone jack. Using an adapter, creates more of a likelihood for audio quality issues, or mechanical failure, because more parts means more potential for failure. For those of us who need the upmost accurate audio potential, this would be unacceptable, and Apple very well knows this. They have a history of using multiple generation ports and that will not change, I am certain.
My argument is exactly the same reason why they kept firewire after releasing usb, usb after releasing thunderbolt, and they will keep thunderbolt after releasing usb C on the rest of the portable devices. They also kept the analogue microphone input, even though there was an on board mic. The only real difference is audio accuracy is more sensitive of an issue.
The lightning port will come soon, but the headphone jack will be around for a ling time to come. Mark my words; The MB line may be heading toward ultra portability, but the Pro line doesn't need to be paper thin and therefore there is absolutely no necessity to remove the jack.