Our own Debian/Ubuntu APT repositories will be soon availables.
Our site http://deb.imscp.org/ is already online but the repositories are not yet pushed on our production network.
At first, we will provide packages for the PhpSwitcher plugin but in near future, we will also provide packaged version of i-MSCP, including plugins.
Feel free to subscribe to https://twitter.com/debimscporg that is the place where most important changes and news are published regarding our repositories.
Source: i-MSCP release