it's not likely to happen until 4g lte is deployed (and it will be a while until coverage is usable), but if you believe rumors, it's being tested now. there's little reason to make a cdma iphone right now.

http://fonefrenzy.com/2009/10/18/big...torolas-droid/

My sources have confirmed that Apple and Verizon have been testing a CDMA iPhone on Verizon’s 4G LTE network. Yes, you read that correctly, Verizon and Apple have been testing the first 4G phone on Verizon’s 4G network. The tests have been taking place for the last couple of months but with no confirmation on the release date.