Will Apple stores honor the AT&T upgrade pricing on iPhone 4 purchases?

I qualify for the iPhone 4 upgrade pricing since my contract ran out earlier this year.

I also happen to still have the iPhone credit Apple issued to iPhone buyers back in 2007.

So I’m wondering if I will be able to buy an iPhone 4 at the Apple store, redeem the credit, plus also pay only the upgrade pricing of $299 for the 32GB model?