WiFiz is a brand new GUI NetCTL frontend. The reason why it uses NetCTL as a backend over NetCFG, is due to the fact that it better integrates with systemd, Arch Linux's new(ish) init scripts.
WiFiz is in beta state, and generally considered stable for daily use. While things may break (and they have! Just look at issue #8!) they will be fixed as soon as possible.
When you install v0.9.2, it will say it is downgrading. Do not worry about this. It's because the versioning changed in the new version.
These dependencies are required for various features.