The Detu F4 (previewed here), a 360-degree camera which is claimed to have 8k resolution at 24 fps or 4k at 60fps will have its world premiere on May 18, 2016 1:30 pm Pacific Time. Here is the official website for the launch. It says "See the world's every degree. Detu F4 professional VR camera global premiere."
Thank you very much to Andre Pariente for pointing out this info to me!