Don't know how a color display or touchscreen will help you with soldering though.
The same as a Mansory will help you with driving,
the display is only for the show.
But the DT-2A seems to be the successor of the DM-2B
At the moment I am looking for a new soldering station,
which will either be a Vario2 from ERSA or the new JBC DT-2A
But if the JBC will be a lot more expensive, compared to the Vario2
which costs around 1450$ with one Tool, I will take the ERSA.