The frameworks branch of PMC now contains a Plasma Shell which basically loads the required QML components and looks/works exactly the same[1]. So technically we are good to go if a user wants her desktop to be a media center.

However, it'll be nice if we can discuss on how the actual workflow could be for a user. Here are some things I can imagine-

* User can have a mediacenter activity which she can switch to for getting the multimedia experience.

* Or, maybe she can configure the mediacenter shell to activate whenever an external TV screen is connected (through HDMI or something).

* The device is a dedicated mediacenter device - the user tells Plasma to always load mediacenter instead of deskop

[1] http://i.imgur.com/J16niw7.jpg