No this is just for HL2 don't worry you wont need the OJ Box. My friend tried it out awhile back, but he told me there wasn't many servers. Well that was awhile ago, show this should of picked up by now. I assume the only difference from Zombie Mod. Is that this one is more team based, but you can still become a "zombie" and by the screens it looks pretty cool when you are the zombie.
Hey I guess it is something to keep you busy until Left 4 Dead comes out.