2012-09-11 23:24:19.571 ExampleGame[9101:15b03] cocos2d: Frame interval: 1
2012-09-11 23:24:19.573 ExampleGame[9101:15b03] Using Nextpeer version (1.2.10). https://api.nextpeer.com/v2/
2012-09-11 23:24:19.857 ExampleGame[9101:15b03] Applications are expected to have a root view controller at the end of application launch
2012-09-11 23:24:19.857 ExampleGame[9101:15b03] cocos2d: surface size: 320x480
2012-09-11 23:24:22.441 ExampleGame[9101:15b03] cocos2d: Frame interval: 15
2012-09-11 23:24:29.960 ExampleGame[9101:15b03] cocos2d: Frame interval: 1
As I never seen this before, asked Daniel/Nextpeer and he confirmed it's not related to Nextpeer, but rather "has to do with how Cocos2D manages the UIWindow and root view controller objects for game. Nothing too serious :)"
Just not sure is Cocos2D trying to tell us something is not right? Compared to my other code, it seems it's because there's no RootViewController been used in the AppDelegate that's causing this to happen. As the app still works perfectly - which proves that Cocos2D can run without a RootViewController, so we probably can ignore that.