We've seen iPads before. We've seen keyboard cases. We've even seen lots of styli. But as happens so often, Apple has remixed existing elements into something new, driven by design, ease-of-use, and compelling third-party apps.
Laptop-level power; Surprisingly light; Pencil accessory is the best stylus experience on a mainstream tablet
Very expensive; Touch-centric UI with keyboard is awkward; Apps don't quite complete your workflow