I think this is only referring to any photos that you have previously uploaded for hosting on the Photoshop.com web-site. I received a similar email as well, as I vaguely remember hosting a few images there several years ago.
The email has nothing to do with your Lightroom library (i.e. the original files). However. if you subsequently export and upload to Photoshop.com, then obviously the upload part will change as the uploads will be transferred to Revel.