support says it will be added back in Q1 2018.
Oops, too late. I wonder if I can backtrack to the previous version.
Back in Pro 2.1.2 released today: Release notes for ArcGIS Pro 2.1—ArcGIS Pro | ArcGIS Desktop
Confirmed! Thanks for the heads-up!
Just tried Copy Raster with an ecw in Pro 2.1.2. Failed: unsupported format.
Jill, we don't have any other reports of ECW failing after the 2.1.2 update. It would be best to open a case with technical support to investigate. Thank you.