Interesting having a little look at my booking on the website and thought i would take a look at if any upgrade space has opened up on the CPT-DXB-CPT sectors , nothing , but it was showing no upgrade space for the ADD-DXB sector either. This was strange as the EK App was showing space open on the ADD-DXB sector. So a good idea to have and check the app regularly as well.
EK Website
App