The installation image is included on their Downloads page, where you have to choose the version (you can still get 15.10 if you want), and then the architecture (Raspberry Pi 2 & 3, duh).

Expand your Raspberry Pi's connectivity with the official USB 3 Hub, supporting high-power peripherals and universal compatibility for all Pi ...

The third major version of the Raspberry Pi will go on sale Monday, with the $35/£30 credit card-sized Raspberry Pi 3 Model B now sporting a 64-bit processor and embedded Wi-Fi and Bluetooth.

Raspberry Pi 3 has a 64-bit processor and built-in WiFi And it's around 50 percent faster than its predecessor.

Raspberry Pi 3 B+ has faster CPU, Wi-Fi, and easier compliance testing Keeps the same form factor and $35 price.