Can someone tell me what are the main features on the Sony SW2 Smartwatch? I'm finding all the information a bit confusing.

Think of the smartwatch as a smartphone but in miniature so it fits on your wrist.
You can get email, facebook, twitter.
It's touch screen and has a vibration that can remind you about appointments or when you're getting calls.
It's just a way of making smartphones even more accesible to users.