Microsoft need to put many other style (no?). Because it's near to be all same sound!
I would be shocked if they don't. In fact, I wouldn't be surprised if none of these are even in the final build. This is a beta emulator. Content like ring tones and alarms are extremely easy to add at the last second and often is so that they can keep it close to the vest.
They're all from the same instrument.
I think these are just here for demonstration purposes. MS should know the deep hole the need to climb out of, and how important that each element of their new platform need to be, down to the most insignificant alarm sound.
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