Concept:
No major changes here, but a couple that are worth mentioning.
The quick one to talk about is the option to change to a simpler dialog box. By picking on the button (1) below, the user can see a simplified version of the dialog box, viewing only the more common settings.

Background Plotting:
Here's an idea - why not send the plot off to work in the background while I get back to work? The new "Plot in Background" option (2) lets AutoCAD take of monitoring the plot. This will show up as a "Status Bar Tray Icon" as shown below:
Once the job is finished, you will be alerted when the plot is finished (above). If you click on the link for details, you will get a list of messages about the last and previous plots:

Maybe not the biggest advance in plotting, but a nice addition.