Earlier a statement by Team Hacksung that the custom ROM will not support S4 was taken as an official word from Cyanogenmod but, soon a clarification followed Cyanogenmod camp that it is not going to decide on its stance up until the handset goes on sale. With S4 already on the shelves Cyanogenmod has released nightly builds for the Korean electronics giant’s flagship phone.
As of now the builds only support Canadian and T-Mobile variants of the S4 with support for the international i9505 coming soon. The team hasn’t confirmed whether Cyanogenmod will be supporting the Exynos Octa or the other i9500 variants.
We would recommend that if you consider yourself a novice when it comes to flashing smartphones and installing custom ROMs please, refrain from using Cyanogenmod or other such ROMs.