You have to be using the 2012 Process for the Dehaze filter to show up.
The Camera Calibration panel indicates I am using the 2012 version. I do notice that my LRCC 2015 version does not state it is LR CC2015 1.1; rather solely shows as "LRCC2015" - yet when I attempt updates I get a response saying I have the most uptodate version. Could that be the issue? If so, how do I force it to update to version 1.1?
Open the Creative Cloud app and update from that. You should be running LR CC 2015.3.
Something is wrong with CC giving you the latest updates.
You can uninstall CC desktop, then download and install the latest version from here, and see if that helps. The latest version has a Check for Updates menu item off the Gear in the upper right of the CC App:
Otherwise, Adobe posts direct links to the LR installers on this page: