Earlier this week Nintendo UK ran a live stream to show off the NES Classic Mini (we know that's not the official name, but it's better), in which the presenters showed a direct comparison with an old NES, had a look at the UI and then played some of the included games.
The live stream has now been uploaded to YouTube so that you can watch it at your leisure; it starts for real at about 3:50.
As someone that's pre-ordered one of these your humble writer is still quite excited, and the UI + screen options are neat. That said, the controller cables are rather short; bluetooth would have been a nice feature. The appeal of sitting on the floor near the TV - or having a HDMI cable trail across the room - is less enticing when in your 30s.
In any case, let us know what you think of this in the comments.