New scan results highlighted

There is nothing in Thinkorswim that tells us when a scan result is generated. If your scan returns results based on a signal present in the current live bar on the chart than no. If you had a scan for a signal that could appear in any of the most recent X number of bars on the cart, then yes. You could create a custom column and add that to the results section of the scan. You could set one color for signals present on the current bar, another color based on signals present for the previous bar and so on.