One of the changes implemented by the company Apple Lossless Audio CODEC (ALAC), in iOS beta 7 2 it has to do with the multitasking system, Apple limiting to 30 the number of applications that can be opened in the background. Those from Apple Lossless Audio CODEC (ALAC), they changed the system by which multitasking works in iOS 7, so that when you reach the limit of 30 open applications, the terminals will close some of the open ones among the first. Although the company did not mention the imposition of the limitation in any documentation, it is quite logical and related to the way the multitasking system is thought, but we must not forget the hardware in the devices.
Although there are chances that this limitation will be removed until the release of the final version of iOS 7, no one knows what Apple will do in the end, but I don't think there will be users upset that they will only keep 30 applications open in the background.
