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Similar to the Transformer Pad Infinity, Asus's Padfone is built on modularity. Asus wanted to create seamless experience between tablet and smartphone, which is why the phone will be sold alongside an 10-inch dockable tablet. We've seen a similar attempt with Motorola's Lapdock phones, and they didn't do so well. Perhaps the Padfone will fare a bit better.
One of the most frequently heard criticisms of Samsung's well-intentioned Galaxy Note is that the device wasn't quite the (write) right size for its stylus functionality. Samsung seems to have responded to that criticism with the Galaxy Note 10.1, a larger device that may be able to better take advantage of stylus input.
Channeling Nintendo's DS, Sony's Tablet P applies the dual screen concept to a pair of larger screens. Part novelty, part useful feature, the device's dual screen functionality allows it to close on itself and fit in places other tablets can't. It's an interesting idea, but it remains to be seen if Sony will take advantage of it.