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From iPhone 5, Apple began to adopt new 8 pin interface data lines. The new data line will save 80% spaces and some can insert from positive and negative. If there is no accident, the following sales of iPad, iPhone, and iPod Touch series all will adopt the new interface.
It seems that the answer to this totally clear yet. According to Apple's description of the new adapter, “Video and iPod Out not supported.” They also describe the adapter as allowing you to connect with MANY of your 30 pin accessories. Many, not all. So, from this, I get the impression that if you have iPhone accessories that use video and iPod out for signal source, they are unlikely to work with the iPhone 5, even with the adapter. Hope I'm wrong.
I hear what you are saying, but a 30-pin connection is a little "old school" to be kind. It's too big, there is only so much space in any smartphone, and a 30-pin connector is a waste of valuable space. After all, would you rather have an archaic 30-pin connector or a larger batter and a little longer batter life? Yeah, I'd take the battery life too. Other than backwards compatibility with some accessories there is no reason to keep the old 30-pin connector.
Anyway, Apple will make some sort of adaptor as the earlier post said, and 3rd party (and cheaper) adaptors can't be far behind. There is no way Apple would want to anger millions of customers by making most of their accessories useless, so don't sweat it.