Not going to happen any time soon.
It also will not be "changing", although at some point in the distant future (certainly not until after the contract between AT&T and apple expires sometime in 2010, unless that contract is extended for another year or two.) Verizon *might* get the iphone.
The Iphone, as it is now, is a GSM only phone, and can not possibly work on Verizon's network, which is CDMA.