IOS six limits the number of your apps.
The current iOS6 developer mode limits the number off apps you can have on your iPod touch, iPhone, or iPad to 1,000 apps. After installing 500 apps, users will notice that their devices will boot rather slowly and auto reboots. If users install 1,000 or more apps, their device will refuse to boot at all. Apple is working on a fix at the moment so people who download massive amounts of apps will have to wait for a fix. But to be honest, who actually has 500+ apps on their iOS devices?
iOS 6 will include many new features. A list of all the new features can be found at:http://www.apple.com/ios/ios6/