Steve Kondik, lead CyanogenMod developer announced that a custom experimental nighly build of CyanogenMod 10.1 is available for the Samsung Galaxy S4. At present the custom ROM is available for the T-Mobile version of the Galaxy S4 (I9505), with support coming for the international version (I9500) soon.
Download the CyanogenMod 10.1 nightly for the Galaxy S4 by following the source link.
