I wrote here yesterday that the Bear Motion case that I used on my iPad 2 fits the iPad 3. And it does. However, when you close the case it doesn't not turn off the screen....so the smart cover feature in the Bear Motion case for iPad2 doesnt' work for iPad3. However, the old Apple Smart Cover does work on the iPad3, but mine has basically come apart so I'm done with the Apple Smart Covers (for what I paid for it it should last 5 years).
Anywho...in looking for another case I decided to see if Bear Motion has a case for iPad3. They do, but it won't hit the street until March 22 (I really like their case...sturdy and puts the iPad at really good position for both typing and videos....way better than Smart Cover. You can see it here:
Amazon.com: Bear Motion 100% Genuine Leather Case with Built-in Stand for iPad 3 / the New iPad (Latest Generation) - Black: Electronics
Note that in the "Technical Details" section of the product description it says this:
Has anyone else noticed any problems which suggest something changed?Apple Changed the Smart Cover Function on iPad 3. Most cases in the market today are having problem. We have this problem fixed and will have the new inventory by Wednesday.
My initial thoughts where that while the iPad2 version fits the iPad3, something must have been slightly out of alignment to make the autolock feature not work. I'm not sure that should be considered a change to the Smart Cover function, but just due to having to make the housing thicker to fit the new battery, which we all know we needed to be done for LTE and the display.