I'm not a fan of haptics when physical keys are an option. I believe that Apple can make a nice demo with vibrating indications of when the user's on a key, then detection of when they push down on it. What I don't believe is that it will be a better experience than feeling the edges of the keys and the actual descent and tap when depressing the key.

This seems like increased complication without any real gain. It's more sleek than usable, kind of like the touchpads with virtual buttons, rather than physical separate ones.

I agree that an actual volume slider would be useful, but I still doubt that there's a good way to present a row of buttons on a smooth flat surface in such a way that they can be touch-typed. Haptic feedback doesn't let you manipulate a typical phone app UI without looking at it.