BioWare to Release Mass Effect 3 Demo Prior to Launch

In a short Tweet sent out a few minutes ago, BioWare has confirmed their plans to release a demo of Mass Effect 3 prior to the sci-fi threequel's launch on March 6th. We're promised further details soon, though no exact timeframe is given:
Yes! We are absolutely doing a demo prior to launch. More info soon!
One would guess that it will be the game's introductory mission, and that the demo will be fully playable, but we'll just have to wait until we hear more before making any assumptions.