What’s New for Windows IoT Core Insider Preview for Raspberry Pi 3

You can immediately download Windows IoT Core for use on your Raspberry Pi 3 that offers the following benefits:

• Functional parity with RPi2, including Windows as a service updating and flighting model and a single FFU for RPi2 and RPi3
• Open sourcing Pi BSP to encourage community innovation/speed and support commercialization efforts

Coming Soon in a future release of Windows IoT Core Insider Preview

• Onboard WiFi & Bluetooth, but in the meantime you can still use a compatible USB WiFi/Bluetooth dongle.
• Functionality for unique innovation, including remote app UI to a phone or windows device, remoting of sensors and actuators from a windows device via UWP and closed loop control capable hardware interrupts via Arduino Wiring and our high performance driver.

source: http://ms-iot.github.io/content/en-US/win10/WhatsNew.htm