I've always been partial to the high end Piel Frama cases, having tried some other high end cases as well. Vaja's were nice for sure, but had strange voids where the product (iPad) wasn't fully protected. Now Apple HAS released the dimensions, and the changes as far as case design are concerned, and Piel Frama already has a full line of 3rd gen cases for almost every use imaginable. I ordered the Cinema. Now I do not have the iPad 3 OR the case in my gritty little hands yet, I have every confidence that it will be flawless.
http://www.pielframa.com/apple/menu-new-ipad-3-cases.htm
Now that I have provided the manufacturer, feel free to look up their various cases reviews for the iPad and iPad 2. I owned a Cinema variant for the iPad 1, and sadly chose Vaja (at an additional expense) for the iPad 2. Good luck and happy shopping to you.