Verizon's iPhone 4 has a CDMA-specific antenna, no other changes made
Would you look at that, Verizon's iPhone 4 has four notches punctuating its external antenna array -- one more than you may find on AT&T's version, with the top notch migrating to the side. Before you all jump on conspiracy theories about fixes and such, Tim Cook has just confirmed on stage that changes had to be made to work on the CDMA network, meaning that for users this is pretty much an aesthetic alteration. Otherwise, you're looking at an almost identical device to what AT&T users have been enjoying since June of last year -- savvy nerds will just be able to tell the CDMA version apart at one glance.