Since we first saw the almost indiscernibly thicker third-generation iPad shell at the 2012 CES, there’s been one question on our minds: will iPad 2 cases fit? Although 0.6 millimeters doesn’t seem like—and truly isn’t—a big difference, the precise tolerances that many case makers work with have potential to cause issues. We’ve had a chance to test a number of different styles of cases, and here our are general…