The word "downsizing" has good and bad connotations nowadays, depending on the context in which it's used. When used to describe camera gear, it's a good term, especially with the advent of mirrorless camera systems.
As compact, interchangeable-lens camera systems go, the Samsung NX10 is noticeably smaller than most entry-level DSLRs and size-wise is on par with Micro 4/3-format digicams. And it can be easily mistaken as a sub-compact member of either tribe. But it’s not until you peek behind the body cap where the NX10 makes you go ‘whoa’.