Either that, or shell out an extra $10 to buy a new "Online Pass" code. THQ's upcoming shooter will be the second game to take advantage of the publishers "Online Pass" model, the first being UFC Undisputed 2010 last year.
Most interesting about THQ's setup is that those without an "Online Pass" will not be locked out of the multiplayer entirely. They'll have full access to the mode, but will be limited to level 5, rather than the game's full 75 level progression. It at least gives players a chance to try the multiplayer if they've not got an "Online Pass" code. That's reasonable.