Here is the confusion that this can make. When should that SGSIII become available to Verizon? I know that you can pre-order it right now in hope to bypass Verizon's new policy. Verizon can actually change your contract to the new plan if the said phone are supposed to be released after June 28. The safer move that will allow you to keep unlimited data is by buying the available phones that Verizon have in store. So Good luck to those that ordered SGS III and under Unlimited data plan.
From what I have been told as long as you order before the date you will be fine.
They were offering the phone before they announced the plan today.
They may cut folks off after today on the pre-order but those that ordered before are safe just like those that go pick up a phone before the 28th.
Changing the terms after you ordered is a no, no.