Uh you got that a bit wrong there.
We used the Apocalypse beta when the INF campaign was started. The 'original Icanus' is the current Icanus, the Apocaylpse and Icanus are two seperate ship designs, though both have really big guns
Our Icanus is used to counter the Gigas, which is our well known super ship.
The Apocaylpse was the first 20km uber ship, but the true Apocalypse hasn't been released yet, since I know there's quite a difference in quality between the beta and final models