If I upgrade to the new iPhone 5 will I lose unlimited data?

I currently have an unlimited iPhone 4 with Verizon, if I upgrade to the new iPhone 5 LTE will I have to switch to one of their tiered data plans?

Added (1). I don't want to pay full retail ($6-700)…

If you buy it for full unlocked price, you can still keep your unlimited

Verizon has stated if you want a new phone at a discounted (contract) price, you have to switch to their new shared data plan.

the ONLY way Verizon allows you to keep unlimited plans now is to pay FULL retail price for the new phone.