Apple will introduce new versions of iOS and OS X at its annual developer's conference.
iPad Unboxing and Very Nice Hands On Video Review
Meanwhile, those looking for something a little more depth should really take a look at this video from PCMag. PCMag posted this excellent walk-through and review of the iPad. The hands on demo of the unit shows many of the iPad's features.
Apple's built-in apps and several 3rd party apps are demoed and shown in real time. The narrator reports that over 1000 apps will be available for the iPad at launch.