How To Keep Your Unlimited Data Plan When Ordering the IPhone4
Seems like ATT is confusing customers or 'tricking' them into losing their unlimited data plan when upgrading to the Iphone 4S. This article goes into ways to not let that occur in your case.
Ive seen a few postings on this forum were someone stated that they were also informed they will lose the unlimited if they switched or upgraded to the i4S. Looks like some 200,000 pre orders for ATT since launch. So you 200,000 , that should be good news for you