Is there anything else then doing the same mission online with your friends over and over again I thought its going to have online and maps to play on the demo?

Nope, just same level.

It's a demo, also either way no matter what you'd be playing the same levels over and over again in campaign since theres only 1 campaign mode for Haze, you'd just be playing it with friends, or whoever.

Well that suks.

I've already answered this 'question' when you posted it elsewhere. Maybe you need to look up the word 'demonstration'.