mine downloaded unusually fast. i was suprised since its such a large file. killzone 2 demo is 1.2gbs and that one went fast for me too, ps3 usually takes longer.
the multiplayer isnt an option in the demo, its clickable so i thought it would be but when i went back after work to finish playing it it just brought up a screen telling me i can play 1v1 2v2 or 3v3.
also the campaign is co-op over live, just found that out too. i havent been reading about this game or anythign, thought i wouldnt like it im gonna have to read up before it comes out but i think im getting it.