"It becomes apparent that Volition are on to something potentially brilliant. Everything, and we mean everything, can be destroyed. If you're thinking of Battlefield: Bad Company with its destructible walls, or Resident Evil 5 with its various shacks and stalls that collapse with a well aimed grenade, you're on the wrong tracks. Buildings, walls, silos, and bridges can all be brought down piece by piece, in real-time, with game-altering consequences."
Details how to get the demo now are in the article.