Verizon is a CDMA network, not GSM (SIM). 4G LTE doesn't use GSM
A) Verizon's network technology is CDMA, not GSM, so there are no Verizon SIM cards in use in the United States.
2) Only the Droid 2 Global and Droid Pro have SIM card slots. They do not work with USA based SIM cards. They use CDMA in the USA and GSM SIM cards in Europe.
It follows then that IF Verizon does in fact announce an iPhone on their network, it will certainly be CDMA and not 4G LTE, as they just released that technology and all of the new 4GLTE phones they announced for it, are powered by Android. It is highly unlikely that Apple worked on a 4GLTE iPhone for Verizon. Even if they had, it wouldn't use GSM technology or a SIM card. Know your facts before you post.