NUCs exist somewhere between classic DIY computer-building projects and ready-made systems from OEMs. Intel supplies a motherboard inside of a box, and you get to pick what RAM and SSD you want to use and install them yourself. Intel will be refreshing all of its high- to mid-end NUCs in the next few months, and these boxes will serve both as systems for people who want a small but fairly capable PC and as a showcase for the new features in Broadwell-U. We got to see and hold the new desktops ourselves, and in addition to the expected upgrades, they bring some interesting features to the platform.
A wider range of systems
Source:
http://arstechnica.com/gadgets/2015/01/hands-on-with-intels-new-mini-desktops-faster-smaller-more-expandable/