I can confirm that Adobe is indeed sending out these e-mails to users of Creative Cloud Packager prior to the release of version 1.13.
If you encounter a problem upgrading after the new version is released, you can either use the link in the e-mail to download the full installer, or delete the 1.12 version and download and run the bootstrap installer named "CCPLauncher" from your team dashboard or enterprise admin console, which are accessible via https://www.adobe.com/ once you have logged in with a valid team/enterprise administrator account.
To remove Creative Cloud Packager, delete the following directory as appropriate:
Windows: C:\Program Files (x86)\Common Files\Adobe\OOBE\PDApp\CCP
Mac OS: /Applications/Utilities/Adobe\ Application\ Manager/CCP