Microsoft Windows 10 will be available to the Raspberry Pi 2. Windows 10 has been designed for the Internet of things. These are devices and programs that are designed to fit together with other connected devices.
From a development point of view Windows programmers will still have familiarisation with the Win32 development tools including access to newer combined connectivity with Arduino. From the view point of a user then you will just have to learn Windows 10 like everyone else but the learning curve will but much shorter for those familiar with Windows.