This provider complements the built-in providers shipping in the latest Windows Management Framework 5.0 preview, enabling a unified approach to managing package installs on networked computers. Here is a brief description of OneGet from the online Powershell help.
OneGet is a unified interface for software package management systems; you can run OneGet cmdlets to perform software discovery, installation, and inventory (SDII) tasks. Regardless of the underlying installation technology, you can run the common cmdlets in OneGet to search for, install, or uninstall packages; add, remove, and query package repositories; and run queries on a computer to determine which software packages are installed.
As this is an open-source project we would love to see the App-V and Powershell communities get involved and contribute. For more information about getting started, check out the project page and join in the fun!