At Build developer conference last week, Microsoft made several aouncements related to Windows 10 IoT. They have also released a x64-bit version of Windows 10 IoT Core Pro edition. This release will allow OEM/ODMs to move between Windows 10 IoT Core and Windows 10 IoT Enterprise without the need to maintain a separate firmware image for their devices. Also, Microsoft is making the Board Support Package for the Raspberry Pi open source to help OEM/ODMs provide a customized board experience.
Read more about this aouncement here.