I've loaded up Windows 10 IoT for RPI 2 previously. It is a Windows kernel, but otherwise massively cut down. It limits the system to a single running "foreground" application at a time, plus some system services.
If you wished to dedicate the device to a single purpose, it's fine, but don't expect a robust shell environment like you would see on a bare bones linux box. It certainly won't support a user using it as a desktop environment. Think of it more as embedded Windows offering, great for being a single app server, robotics platform or kiosk.
Which just makes me wonder what the point of it is. I guess if you really love Windows and want to build an embedded system this would be the way to go. I'm betting that most people that build embedded systems are not Windows developers and I'm not sure that this IoT offering changes anything.
I'm starting to wonder the same thing. I've been looking for a project to try it out on but every time I think I find one, I realize that it's something I can't do with Windows 10 IoT because it lacks a key feature (e.g. printing) and the time it would save on other aspects would be wasted trying to work around it's inadequacies in other respects.
