This isn't some new official Fedora Linux project or an initiative about having a Fedora phone to compete with Ubuntu's smart-phone/tablet efforts, but rather it's an installer released by Rob Clark. Rob's efforts have been to enrich the Freedreno Gallium3D graphics driver that he started as a reverse-engineering effort of the Qualcomm Snapdragon graphics core. In supporting the Qualcomm A320 graphics he's been using a Nexus 4.
In developing his Gallium3D driver for the A320 / Nexus 4, he wrote a Fedora 19 installer in the process. It can be found on GitHub as freedreno/nexus4-fedora.
With it coming out of the Freedreno project rather than upstream Fedora, don't expect full/continued support, but it's fun nevertheless if you want to play with Fedora 19 natively on the Nexus 4. Unlike the Ubuntu Phone/Tablet versions, Fedora on the Nexus doesn't get in the way by having a CyanogenMod layer.