"Just Cause 2 uses Steamworks all the way," Square Enix London Studios community manager revealed to Shacknews commentor acare84 through the magic of Twitter. nope
Steamworks integration means that developers can use Valve's digital distribution platform Steam for such features as matchmaking, automatic game updates, downloadable content, plus server-side save and setting storage.
However, said integration also means that Steam must be installed for the game to be played, which has caused rival digital distribution outlets to not sell such titles.
The explosion-filled action game grapples its way to PC, PlayStation 3 and Xbox 360 come March 23, with a demo offering 35 square miles of game world on March 4.

If you're playing a game and you're connection goes off, steam automatically asks you if you want to switch to offline m...
seems somewhat 100% likely you will be able to. it is a console game after all