Juli Clover, writing for MacRumors:

In recent weeks, Apple has been sending out surveys to users asking about MacBook Pro features, most notably the headphone jack. A survey question shared by MacRumors reader Blake asks “Do you ever use the headphone port on your MacBook Pro with Retina display?”

There are several other reports on Twitter from users who have been asked similar questions about the headphone jack, suggesting Apple is exploring the removal of the headphone jack in a future version of the MacBook Pro.

If there is a MacBook Pro update coming this year, I suspect it will have a headphone jack. This sort of market research would typically be done during the design phase, not in preparation for product rollout. I suspect the headphone jack will, ultimately, go away, as wireless becomes the standard. On the iPhone 7, waterproofing and case real estate are often quoted as two driving reasons for the removal of the headphone jack. Neither of these is a big issue for the MacBook Pro.