Patently Apple has a few new patent illustrations from China that may hint at future iPad hardware features. The first is a second dock on the side of the tablet. As you can see above, the connector would come in handy if you wanted to view the iPad in landscape form, but didn't want to have a cable sticking out of the side. Personally, I can't really see Apple duplicating functionality in this way, though -- while a second port would be handy, it seems a waste to have a completely separate port used only half the time. Like most patents, this is only an idea at this point -- Apple isn't required to actually use it in a future release.
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