Sep 4 2018
Yep. Having checked the 320px thumbnail of the baby bath image previously mentioned, I can confirm that Exif.Image.ImageDescription is now being preserved, and Exif.Image.Copyright and Exif.Image.Artist are still being preserved, ie no regression.
Sep 2 2018
Does 'merged' mean the change is now live, or is there a further release process?
Aug 30 2018
@Gilles An example image below. Yes, it seems that the Xmp description is being preserved (ie "Xmp.dc.description"). Perhaps Xmp is favoured over Exif now...
Jun 28 2018
I can confirm that Exif.Image.Artist and Exif.Image.Copyright are preserved in resized jpgs. Excellent, thanks!
Jun 5 2015
I put the issue of copyright and licensing information removal to wmf legal as suggested by Bawolf (thanks for the suggestion). The response was: