Oh crap. Speakers. That would be the biggest issue. If the speaker placement has changed dramatically, we're in trouble. Otherwise it SHOULD be fine. Let me see if I can check some hands on pics.
Okay, whew. Bullet, dodged..
The iPad Mini, however, has gotten the full redesign with the speakers on either side of the connector. Freaked me out for a second, as I thought it was a pic of the 4..
Regardless, because of this all iPad 2/3 cases will work, and it just saved me $60ish dollars!
Now, to find a cheap and sturdy iPad Mini case!