Apple and Samsung court case has been escalating and it seems to reveal more on the design aspects of their products. Both sides are claiming that some part of the products were copied, from phones and now to tablets.
As you can see above, the picture shows Samsung products before iPad and after iPad. In my opinion, I think the design is evolved based on the software needs and current trend.
Nevertheless, it will be up to the court and their evidences to do the talking. Here is another picture showing other brands of tablet.
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(source)