Reading a lot of threads, it appears Apple changed the polarity of their on/off magnet. Some cases with a beefy magnet still work while many others that were designed for the New iPad do not. I would like to keep a running list of what works and what does not. Please post your results if you have a New iPad case that works, a New iPad case that does not work, or an iPad 2 case that both fits and the smart on/off switch works and I will add them to the list.
CONFIRMED WORKING:
Apple Smart Cover
Choiix wake up folio for ipad 2 (barely fits and smart cover works)
Switcheasy Canvas (for some people, problems for others)
Sena Florence
Piel Frama Magnetic Case
rooCASE Duel View
Bear Motion leather folio (kdoug claims worse quality than iPad 2)
VENDOR CLAIMS WORKS:
Devicewear Detour 360
Devicewear Peak
Yoobao Executive iPad 2 (works for iPad 3, but iPad 3 case coming)
CONFIRMED NOT WORKING:
BOOQ Folio
Targus VersaVue
Targus Slim Case
Mophie cases
Charcoal SwitchEasy
rooCASE Convertible
HIT OR MISS:
Targus VueCase
Targus Slim Case (mostly miss)
Maroo - Black (mostly miss)
STM Skinny (company will replace non working ones)