A vietnamese tech website was allegedly able to get their hands on an iPhone 7 and told us that it supports recording 4K video at 60 fps. It also found out that sim card slots are sealed now to improve on water resistance. You might also wanna take a look at the beautiful render pictures of the new black color options.
http://www.notebookcheck.net/Apple-iPhone-7-6-SE-The-next-iPhone-may-be-the-first-phone-to-support-4K-video-at-60-fps.173577.0.html