It's a rather unfortunate piece of news for AppStore developers, as a group of hackers have discovered an exploit that will allow a user to install cracked apps without the use of a "rooted" iDevice.
The group, iModZone, has created an App which goes by the name of IPA God, and claims that they have successfully been able to install these "cracked/beta" apps via their program. This potentially leads to a large amount of loss in sales for developers that work extremely hard to produce quality apps, which is a huge discouragement for any developer.
The hackers posted a video that demonstrates the process, but it's not really 100%, as we have no idea what Firmware they are running except for their claims. I'm also a little confused as to how they even got the installer on the iPad.