The Samsung NX are reflex-like cameras, without mirror or pentaprism, but aiming directly on the sensor. Advantage: their back focus is less than the Leica-Zorki-Fed one, I can use their lenses through an adapter ring (except the 5.6/20mm and 2.8/35mm, which protrude too much at the back).
LTM-NX adapter ring (29$ on eBay)(LTM=Leica thread mount)
I'll be able to test my 50mm rangefinder lenses, in conditions close to the tests for my 50mm SLR lenses. The NX11 gives 14.6 Mpixels for 10.1 for the 400D and the sensor is slightly larger. The first trials (here with Jupiter 3 1.5/50mm) are very encouraging.