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From a size perspective all gen 1 cases should fit the rMini. The size dif. Isn't that big. But keep in mind there is a new microphone on the back which will be blocked by gen 1 cases.
 
I just ordered a Tumi iPad Mini case for my iPad mini Retina. The case, in orange, is currently on backorder. I believe the new retina mini has slightly bigger dimensions than the 1st gen. Has anyone used cases from their previous mini's to the current retina?

Thanks!

http://www.tumi.com/product/index.jsp?productId=17797426&prodFindSrc=paramNav

Most cases the extra 0.01 thickness won't be an issue, the main problem you'll probably have with this case is that it covers the second mic on the back of the mini.
 
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