App Store becomes much more active everyday and already hosts more than 450 iPhone games. New games are added every day and many of them takes updates.
There is two way of knowing about fresh iPhone games. First is to visit this blog surely or use a web service called GotApps. This is an alert system of new apps on the App Store which will email you on the keywords you set up.
You should sign up an alert for Games category and that's it. The service emails you if it finds a new tab. Recommended!