So i went to order the bionic and on the page where it shows changes made it did not list unlimited data and it showed my bill would be $30 less a month. I assume it dropped it from my plan in favor of pay as you go.
Look again, it should be there for you. If you didn't make the change then there's no reason for your unlimited to be gone. If for any reason you can't find it, call CS and get it back and order the phone then.
There should be a widget for the phone where it shows data usage, it should say "unlimited" underneath if you are, my Droid Charge has this and my co-workers X. When we get our Bionics tomorrow we will check this out.