The Raspberry Pi 2 was released recently and it seems it'll come with Windows 10. At first this came as a shock but when you look at the spec the little thing has and then realise this is a custom windows 10 platform just for embedded systems its quite a good move by a large company to help the Pi community and also generate a bit of business of their own.
If you want to look at the features for this embedded Windows 10 you can find it on the Windows Developer Program for IoT website.
I love using my Raspberry Pi as a "Dedicated Device." While it's clearly a general purpose computer, it's so cheap and powerful I'll use it for one thing and have it do that one thing well. Watch for water in my basement and text me if a sensor gets wet. A tiny Minecraft machine for my kids. A 3D Printing Print Server. A small games emulator. An open source media player.