Originally Posted by UrsusVIIILXXXVII
It's my understanding that even if you buy a phone at full price now and switch to 4G, when you then use your upgrade later for the Fighter you'll be forced into one of the tiered data plans.
Only if the Fighter is released after the tiered plans take affect. There is still no official word on when either is going to take place.
I ended up caving and placed my pre-order for the S3. Just didn't want to take the chance of losing unlimited.