SLR cameras, with a moving reflex mirror behind the lens mount, need a fairly long register distance. The reason why Micro Four Thirds cameras can be made more compact than SLR cameras, is that they don't need the reflex mirror, and can have a shorter register distance.
A lens mount with a short register distance can be considered a universal mount, since it is possible to create adapters for mounts with longer distance. Micro Four Thirds is such a mount. There are adapters for a number of different formats, e.g., Nikon F and Pentax K.
For comparison, here is the register distance of various formats:
|Samsung NX Mini||Very short|
|Sony E (NEX)||18.00mm|
|Leica L (T and SL)||19.00mm|
|Micro Four Thirds||19.25mm|
|Konica Hexar RF||28.00mm|
|Olympus Pen F||28.95mm|
|Minolta AF/Sony Alpha||44.00mm|
The new Samsung mirrorless NX format has a longer register distance than Micro Four Thirds. However, the Samung format still has a shorter distance than most relevant formats, e.g., Leica M, so that it is possible to create adapters just as easily as for Micro Four Thirds.
On the other hand, the Samsung NX has a register distance about 2mm shorter than Leica M, which may be why Novoflex has not yet announced an adapter for it. 2mm may be too short to make a quality adapter.