Here’s some more info on the Insta360 Nano‘s availability: It will be available in the US in early April. The primary distributor will be B&H Photo Video.
Also got more info on its operation and compatibility. The Nano connects only to an iPhone with a lightning port. It cannot connect to an Android phone, even with WiFi. However, you can use the Nano independently, without being attached to a phone.
Does that mean Android users will just have to make do without a smartphone interface? Fortunately not. Insta360 will release an Android version of the Nano around June or July.