We had previously seen details of CyanogenMod 10.1 running on the T-Mobile version of the GALAXY S 4. As of today however, it looks like we now have word that the nightly builds are available for those who want to begin playing. The details are coming by way of Steve Kondik who recently made mention that the T-Mobile GALAXY S 4 nightlies have arrived and that they will be porting CM10.1 to other variants when they get the devices.
As far as the T-Mobile version of the nightlies, this one comes with the warning about how there are still a "few rough edges." Perhaps key though, it was also said that these rough edges will be "ironed out in short order and you should be able to use it as your daily driver without serious issues."
Of course, remember that these being nightlies -- there may still be some issues and quirks. Other details mentioned about this build include how the touchscreen "should" support hover events. Remember though, while there are different variants of the GALAXY S 4, you will need to make sure you are using the correct build for your particular model.
That is to say that if you have a GALAXY S 4 that is not the T-Mobile version (SGH-M919) you shouldn't try to install this CM10.1 release. Basically, just sit back and hope that the other devices come available so the CyanogenMod team can work to complete the port. And for those wondering, the I9505 was mentioned specifically.
[via Google+ Steve Kondik]