The sheer amount of
iPhone 5 cases for sale right now is proof enough for me that we are going to see a redesign on Tuesday. For these companies to spend serious money on injection molding tooling would mean the end for lots of them.
Lots of you keep harping on about the specs being of huge importance and a redesign being off much less interest, but in all honesty the huge majority of the public don't care are about specs, they just want the latest iPhone. If it looks the same as last years it will just not be as attractive a purchase.
iPhone 5 Tuesday, you have my guarantee