Vojtěch Trefný sent out an update today on the state of blivet-gui and overall things are looking fantastic. He continues making progress on simplifying the UI for complicated disk configurations, support for LVM snapshots and LVM thin-provisioning, the code is now Python 3 only, and more. For blivet-gui 2.0, work is being done on big API changes, support for LVM cache and LVM RAID, and more. Besides the code being available on GitHub, there's also a Fedora Copr repository for trying the very latest packages.
More details via Vojtěch's blog.