This kind of goes with the RAM/NAND thing, but it'll have a MUCH better browsing experience. In a similar vein, watching 800x480 movies fullscreen should work prefectly.
The internal Wi-Fi and Bluetooth will be nice, if only for the reason of not having things sticking out of the device.
More pixels on the screen means you can see more of whatever you're doing.
A full-sized USB port means you don't need a cable to connect your mouse, USB flash drive, or keyboard. Plus, it has a USB OTG port, so you still can use the Z's host cable to connect 2 USB devices at once.
It has all-day battery life (well, working day for most people, at least, even assuming you're using it constantly).
Apparently people have discovered how to do basic pressure sensitivity on the TS, so things like GIMP (which should run very nicely, BTW) will be even cooler.
Lastly (for this post), the people who ARE getting one. myself included, will talk about how awesome it is and make you feel sad that you passed up the chance to get one from the first batch and now have to wait until ~March.