I don't think DAC technology has changed much over the past 10 years, perhaps even longer. Some of the better DACs being made today use ancient circuits and some very old chips that have been squirreled away because they sound better than modern chips. After all, the priority with each new generation of DAC chips is NOT sound quality--it is smaller size, lower power consumption, and more tasks handled by the chip--all for the sake of portable devices.
Some of the better, ultra expensive DACs, like those from Audio Note, and the Reference level music servers from NAIM, use chips that are 20 years old or so.
Some of the better, ultra expensive DACs, like those from Audio Note, and the Reference level music servers from NAIM, use chips that are 20 years old or so.