On March 18, 2012, I posted: I got a new iPad 16GB WiFi only on March 16th. WiFi was cutting in and out so I exchanged it for a new unit. New unit does not have any WiFi problems.
I lied. If I do the "death grip", i.e., landscape mode with volume buttons at bottom, I lose my WiFi connection. If I turn it around, I reconnect; turn to death grip, lose connection. It's like clockwork . . . or a trained monkey.
Router is about 50 ft down the hallway connecting at N 5 GHz band on Linksys E3000 router. No problems with original iPad, iPhone4 or other wireless devices. I don't use a case or cover with the new iPad (and don't plan to so I hope Apple's wonderful and brilliant solution won't be a free case).