http://news.bbc.co.uk/1/hi/wales/7986233.stm
Peter Ridsdale explains that City have three matches coming up in the new stadium in July. The club have to build up crowd numbers to get the relevant safety certificates.
One of the games, the second one I believe is thought to be against Chasetown. The big opening day game is being speculated as a possible game against a club that has some historical involvement with Ninian Park like Aston Villa or Real Madrid but it's anyone's guess at the moment.