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not using a bezelThe black (or white) border around the iPad screen is effectively a bezel.
> having an all glass front
The all-glass front is neither unique to Apple nor truly optional. Edge-to-edge touch capability requires that the glass extend far enough past the edge of the screen to allow touch gestures to work across the full screen. A "bump" going from the screen to the bezel makes it nearly impossible to effectively touch at the edges.
If you extend the glass past the screen but then also introduce a "bump" to transition to plastic or some other material, you either make the device bulkier, make it uncomfortable to hold, or both.
> an aluminum back
Meh. This a functional element, because it dissipates heat better. But it is optional. However, it hardly constitutes a clone by itself.
> black buttons
The buttons on the tab are completely different, in that there are multiple and also in that they are just capacitive buttons. The color of the buttons in both Apple's and Samsung's designs are chosen to match the bezel. Note that Apple does not put a black button on the white iPad, because it would look stupid. Even the original Kindle had color-matched buttons (ugly as it was).