After the iPad 3 event invite didn’t show a button, some were quick to come to the conclusion that there wouldn’t be a button on iPad 3. We think this is highly unlikely. Among many other reasons, there is one in every leaked iPad 3 part, as shown by these digitizers on Fix-iPhones.com today.
Also we see both black and white colors represented. We had originally heard that there might only be one color of the base model iPad 3 but a few hours later, we found the new part numbers which indicate both colors would be introduced. Another image below: