A tablet is, by definition, a minimalistic device. Concepts like "rounded borders" have been used for quite a bit longer than tablets, and applying a basic design principal should hardly be considered infringing.
No one is going to buy a Samsung device because they think it's an iPad- or even that it looks like an iPad. The difference between the two devises is really about the internals and, much more importantly, the operating system. I've got a ton of Apple devices that I really love, including an iPad, but I really don't see this as anything other than Apple trying to shut competitors out of the market.