Months and months ago, Canonical announced the Smart Scopes project,--as part of the online Dash initiative--, designed in mind with significantly extending the Dash's search capabilities.
Essentially, the developers are to probably implement in Ubuntu 13.10 a vast, handy and diverse bundle of default scopes, including Wikipedia, IMDb, Clementine, Audacious, Yahoo! Finance, etc, making them available at a press of a button directly via Dash home.