The iPad HD will not be a full-blown successor to the iPad 2. This will be a more higher end than the iPad and will be aimed at video and photo production. The display is said to be double resolution and will sit at 2048 x 1536.
iPad HD won’t be the iPad 3. Apple’s newest operating system, iOS 5, which is set to launch in September. iOS 5 brings more than 200 new features, including Notification Center, iMessage, Twitter, Newsstand, enhanced photo functions and more. iOS 5 is expected to be the operating system of the new iPhone 5.
It seams like iPhone 5 will be released on AT&T and Verizon simultaneously