No. Nokia 6.1 (2018) does not have the autofocus in the front camera. It has fixed focus camera as selfie camera.
Nokia 6.1 (2018) is 8.6 mm thick.
Yes, Nokia 6 (2018) does have the Corning Gorilla Glass 3 protection. You can check this video, which is about Nokia 6 screen scratch test.
Yes, Nokia 6.1 (2018) does have the headphone jack and USB Type C port also.
Yes, Nokia 6.1 does support fast charging. During our tests, we have found that it took about 30 minutes to charge the battery from 0% to 50%.
At the end of the day, the Nokia 6.1 (2018) brings some welcome improvements over its predecessor.