People in Cleveland have been really impressed with Cooper so far. Now that the Browns took Gordon, Cooper is right on the bubble sitting at probably their #6 or 7 WR. Most teams keep 5 or 6 on their roster, and considering they have Josh Cribbs as one, I'm betting they'll keep 6.
A lot will depend on how he performs in the preseason. And even if he doesn't make the opening day roster, he's got a great shot at making the practice squad and being called up during the season.