Just a reminder that if you're interested in the Nikon Keymission 360, there's a promotion offer where you will get a free KeyMission Accessory Pack that includes a mini-tripod, extension arm (handle / selfie stick), carrying case, and rechargeable battery, but only if you preorder by October 22 (today).
The Keymission 360 is available from B&H Photo with free 2-day shipping (double-check if free shipping is available where you live) and from Amazon with Free Prime shipping. Depending on where you live, you might not need to pay a sales tax with one or the other. I've confirmed with B&H that if you order with them, you'll receive the free accessory pack as well. I've confirmed that Amazon has the free accessory pack as well but you have to choose the "accessory bundle" (see link above).
At $499, the Keymission 360 is more expensive than the Samsung Gear 360. However, if you include the value of the Accessory Pack, it decreases the effective cost.
The Nikon Keymission 360 is a fully spherical 360 action camera with 4k video, that differs from its competition because it is waterproof and shockproof even without an external case. Here are the key specifications. The release date is October 26, 2016.
I ordered one as well and will post a review as soon as I receive it, which is hopefully by the end of next week.